Updated: June 2026 · by Sonja Spörlein · Reading time approx. 8 minutes
Let's be honest: There's little that's as annoying as a sensor whose edge comes loose on the first really beautiful summer day, barely after you step out of the outdoor pool. I'm Sonja from Zuckerschmuck, I live with type 1 diabetes myself, and I know this summer sensor issue from my own experience, just like many of you in our community.
First, the good news: If your FreeStyle Libre 3 doesn't stick as well in the heat, or your Dexcom G7 causes problems after sports, swimming, or sunscreen, it's almost never your fault. Heat, sweat, water, and skincare products particularly challenge the adhesive strength of the sensor in summer.
In this article, we'll look step-by-step at why sensors can come loose more easily in the heat, how to prepare your skin before application, what manufacturers say about swimming and bathing, how to classify skin reactions, and how to gently remove adhesive residue after a sensor change.
☀️ At a glance
- CGM sensors are only temporarily waterproof. You can find the respective information in the table below.
- The adhesive strength of the sensor largely depends on preparation: clean, degrease, and allow to dry completely.
- Sweat, sunscreen, water, and friction can affect the sensor's adhesive surface in summer.
- Zuckerschmuck tapes and sensor stickers are decorative accessories for individualizing your sensor.
- If you experience itchy, weeping, or recurrent irritated skin, you should seek medical advice.
Briefly in advance: This article is a guide from the diabetes community and does not replace medical advice. For skin reactions, please consult your diabetologist or dermatologist. The detailed disclaimer can be found at the very bottom.
Why does the sensor come loose in heat and sweat?
The reason often lies directly with the sensor's adhesive surface: moisture, skin oil, and warmth can affect the adhesive strength of the sensor. Sweat can get under the adhesive surface, while high temperatures soften the adhesive layer. As a result, initial problems often appear at the sensor edges.
Added to this are the typical summer classics: sunscreen on the application site, prolonged bathing, frequent swimming, and friction from towels, clothing, or backpack straps.
Abbott explicitly names these points—sweating, sunscreen, and water—as factors that can affect sensor adhesion for the FreeStyle Libre [1]. For you, this means that much is decided before the sensor is even applied.
Sensor in Summer: Swimming, Showering, and Sports
Most modern CGM sensors are waterproof, but only within certain limits. They are designed for everyday situations like showering, swimming, or sports, but not for unlimited water contact or deep diving.
How waterproof is my sensor really?
Manufacturer specifications differ significantly. These values only apply to a correctly applied sensor:
| Device | Waterproof according to manufacturer | Practical advice |
|---|---|---|
| FreeStyle Libre 3 | up to 1 m depth, max. 30 min. [1][2] | Adhesive according to Abbott since 2020 without IBOA [6] |
| Dexcom G7 | up to 2.4 m (8 ft), max. 24 hrs. [3] | Dexcom includes a manufacturer-supplied overpatch; keep as dry as possible for the first 12 hrs. [7] |
| Omnipod 5 (Pod) | IP28: up to 7.6 m, max. 60 min. [4] | Controller/PDM is not waterproof [4] |
| Medtronic Guardian 4 | Manufacturer specifications inconsistent → check current instructions for use | upper back arm recommended [5]; please follow manufacturer's instructions |
Specifically, this means: showering, swimming, and sweating are permitted within these limits. However, a long dive, very hot water, or sauna can additionally strain the sensor's adhesive surface. After prolonged bathing, it's best to gently pat the area dry instead of rubbing vigorously.
Proper preparation: Sensor adhesion begins before application
Abbott recommends this sequence, and it makes a big difference in summer [1]:
- Remove body hair at the application site, if necessary.
- Clean skin with water and soap; for oily skin or sunscreen, additionally degrease with a non-greasy alcohol swab.
- Allow to air dry completely.
- Apply sunscreen generously, but avoid the future application site.
- After strenuous exercise, wash and dry the area again.
Sounds simple, but it's often the crucial step. Only on clean, dry, and oil-free skin can the sensor adhere as intended by the manufacturer.
Customize your sensor: Decorative CGM Tapes
Many people with diabetes don't want to hide their sensor but rather integrate it into their personal style. That's exactly what Zuckerschmuck's decorative CGM tapes and sensor stickers are for.
Whether transparent, subtle, or colorful: a decorative tape can visually integrate your sensor into your everyday life or deliberately make it an eye-catcher. Especially in summer, waterproof designs are popular because they suit swimming pools, holidays, sports, and active days.
Important: The adhesion, function, and wear time of the sensor are exclusively governed by the specifications of the respective sensor manufacturer. Zuckerschmuck tapes are decorative accessories and serve no medical purpose.
👉 Transparent, waterproof tapes for decorative customization of your sensor can be found in the collection Classic and subtle CGM tapes, for example, the transparent, waterproof SCHMUCK tape for Libre 3 or the version for Dexcom G7. And if you like: the same tapes are also available in colorful designs, because your sensor is allowed to be visible.
Skin protection under the sensor: Using barrier film correctly
A barrier film is an ultra-thin layer between the skin and the sensor's adhesive surface. Sprayed or dabbed on, the solvent evaporates after a short time, leaving a transparent, breathable film [13]. Dexcom explicitly mentions such a barrier film as an option for irritated skin [8].
Three things are particularly important here:
- Leave a gap: Where the sensor needle pierces, the skin must remain clear. The sensor should only be applied to clean, dry, and intact skin [8].
- Film instead of cream: A film-forming spray or wipe that dries completely should be used under the sensor. Greasy creams or ointments can impair the adhesion of the sensor.
- Be realistic: A barrier film can reduce irritation and mild irritative reactions [9][13], but it is not a reliable protection against a true contact allergy. For recurring complaints, medical clarification is important [10][13].
👉 Film-forming, often alcohol-free products can be found in the collection Skin Protection + Adhesive Remover, such as the alcohol-free skin barrier film spray or the skin barrier film wipes. If you want to use a customizable skin barrier plate, you can find it as a cut-to-fit skin barrier plate.
Skin reactions to sensor adhesives: What to do?
If the skin under or around the sensor itches, burns, or remains red, there's no reason to simply grit your teeth. The first important distinction to make is that not every redness is automatically an allergy. Clinically, irritative reactions are differentiated from allergic reactions. They look similar but have different causes and consequences [10][11][12].
| Irritative Reaction | Allergic Reaction | |
|---|---|---|
| Trigger | Moisture, occlusion, friction, mechanical stress | Sensitization to components of the sensor adhesive |
| Pattern | usually clearly limited to the contact area | can extend beyond the direct contact area |
| Time course | often rapid, usually subsides more quickly after removal | often only after weeks to months, can persist longer |
| Signs | Redness, pressure marks, irritated skin | severe itching, blisters, scaling, persistent discomfort |
Typical triggers for a true contact allergy in CGM and pump adhesives include isobornyl acrylate (IBOA), other acrylates, and modified colophony [10][13][14]. Once sensitization has occurred, it usually persists, so avoiding the trigger is paramount [10].
What you can observe and prepare yourself, without it replacing medical advice:
- Change and rotate application sites: Systematically alternate application sites, for example, left arm, right arm, or abdomen, so that the skin can recover.
- Test barrier film: This can be more helpful for irritative reactions. The skin must be completely dry before application.
- Document reaction: Note photo, date, and affected device. This also helps later in practice.
And when to see a doctor? For weeping, intensely itchy, extensive, or recurrent reactions, and whenever several different devices cause similar problems. The usual procedure for suspected allergies is an epicutaneous patch test in a dermatology practice, possibly with a special test series for medical devices including IBOA [10][15][16]. Your doctor will always decide on a treatment.
Want to dive deeper? In our guide Help with skin irritations from sensors and insulin pump catheters, we gather community experiences on skin care, irritations, and protection strategies.
Gently removing adhesive residue: Spray, oil, or wipes?
After changing the sensor, adhesive residue sometimes remains on the skin. The gentlest sequence is always the same: first loosen, then slowly peel off, then gently remove residue. Dry, jerky pulling can stress the outermost skin cells and is a common cause of irritated skin [10].
Here's how to proceed in a skin-friendly way [9][10]:
- Loosen the edge and moisten the adhesive surface with a suitable remover product.
- Allow to soak for a few minutes.
- Peel off the sensor flat, parallel to the skin, and preferably in the direction of hair growth, holding the skin with the other hand.
- Gently dab off residue without strong rubbing.
Which product is suitable when?
| Product | How it works | Good when … | Note |
|---|---|---|---|
| Remover spray based on silicone | reduces adhesive strength and evaporates without residue | quick and on the go, larger area | alcohol-free variants can protect sensitive skin [9] |
| Oil like baby oil, body oil, or citrus spray | dissolves fat-soluble adhesive residues and simultaneously cares for the skin | at home, very sensitive skin | wash off thoroughly before the next sensor, otherwise adhesion may be impaired |
| alcohol-free remover wipes | measured amount for soaking and wiping | travel, small areas | dab gently, do not rub |
After removal, it's best to let your skin rest. If necessary, you can use a fragrance-free, lipid-rich cream intermittently. Before the next sensor, the skin must be completely dry and oil-free again.
👉 Gentle products for removing adhesive residues can also be found in Skin Protection + Adhesive Remover, for example, the alcohol-free remover spray.
Device-specific: FreeStyle Libre 3, Dexcom G7, Omnipod & Guardian 4
FreeStyle Libre 3. Water-resistant up to 1 m for 30 minutes [1][2]. Abbott names sweating, sunscreen, and water as summer risks for sensor adhesion [1]. A detail for sensitive skin: According to Abbott, the adhesive has not contained IBOA since 2020 [6]. This reduces the risk of a known trigger substance but does not exclude other adhesive reactions.
Dexcom G7. Water-resistant up to 2.4 m for 24 hours, if the sensor is applied correctly [3]. Dexcom recommends, among other things, rubbing around the adhesive surface after application, pressing the sensor, and keeping it as dry and sweat-free as possible for the first 12 hours [7]. Dexcom supplies a manufacturer-provided overpatch and provides its own application instructions for it. For irritated skin, Dexcom mentions barrier films, among other things [8].
Omnipod 5. The Pod is IP28 water-resistant up to 7.6 m for 60 minutes, but the controller or PDM is not [4]. Please always refer to the current manufacturer's instructions for use in water.
Medtronic Guardian 4. Water specifications may vary depending on the source. Please refer to the current instructions for use here. Medtronic recommends placement on the back of the upper arm for the best sensor life [5].
👉 Custom-fit TapeGuard adhesive aids and decorative border tapes are available for FreeStyle Libre 3, Dexcom G7, and Enlite/Guardian, among others. An overview can be found in the collection TapeGuard Adhesive Aids. They help to apply decorative sensor tapes evenly and cleanly. We show you how this works step-by-step in the article Applying Dexcom tape with TapeGuard. And for those who like color: The sensor stickers are available for many CGM systems.
FAQ: Sensor, Summer & Skin
Is the FreeStyle Libre 3 or Dexcom G7 waterproof?
Both sensors are water-resistant, but for a limited time: the FreeStyle Libre 3 up to 1 m for 30 minutes [1][2], the Dexcom G7 up to 2.4 m for 24 hours when correctly applied [3]. Longer or deeper diving is not intended.
What can I do if my sensor comes loose when swimming or sweating?
Sensor adhesion depends on various factors, including skin preparation, sweat, water, sunscreen, and the properties of the respective sensor. Always follow the sensor manufacturer's recommendations and ensure clean, dry, and oil-free skin before application.
Skin protection under the sensor: Film or cream?
A film-forming spray or wipe that dries completely. Greasy creams should not be used under the sensor as they can impair adhesion. When applying, the insertion site should be avoided [8].
What can I do about skin reactions to sensor adhesives?
Change and rotate the application site, test a barrier film, and document the reaction. For persistent, weeping, or extensive reactions, please seek dermatological clarification [10][16].
How do I remove adhesive residue without irritating the skin?
First soak with spray, oil, or a remover wipe, then peel off flat and in the direction of hair growth, gently dab off residue [9][10]. If you use oil, wash the area thoroughly before applying the next sensor.
Does a barrier film help against an allergy?
A barrier film can reduce irritation because it minimizes direct contact between the skin and the adhesive. However, it is not a reliable protection against a true contact allergy, as the triggers can penetrate the film over time [10][13]. In such cases, medical clarification and, if necessary, a change of system or site are important.
Are Zuckerschmuck tapes medical devices?
No. Zuckerschmuck tapes and sensor stickers are decorative accessories for customizing CGM sensors. They are not medical devices in the sense of the EU Medical Device Regulation and serve no medical purpose.
Your Summer is Yours
You don't have to sit out the summer just because there's a sensor on your arm. With good preparation, the pool, the sea, sun, and sports can be just as much a part of your daily life as they usually are.
And whether you wear your sensor discreetly, transparently, or brightly as a little eye-catcher is entirely up to you. Zuckerschmuck stands for diabetes accessories that make your everyday life more beautiful and give you the opportunity to design your sensor in a way that suits you.
Zuckerschmuck has been around since 2015. We are a specialized retailer for diabetes accessories and a community rolled into one, with over 40,000 happy customers. Do you have your own summer trick that reliably works for you? Feel free to write to us at info@zuckerschmock.shop; we will share the best tips with the community on Instagram and Facebook.
Together we are strong 🌈
Your Sonja and the Zuckerschmuck team
Note: This article is a guide from the diabetes community and does not replace medical or dermatological advice. For recurrent skin reactions, suspicion of a contact allergy, or unusual symptoms, please contact your diabetologist or dermatologist. The mentioned skin protection and care products are not medications. In medical emergencies, dial 112.
Note on Zuckerschmuck Tapes and Sensor Stickers: The sensor tapes, border tapes, and sensor stickers offered by Zuckerschmuck are decorative accessories for individual customization of CGM sensors. They are not medical devices within the meaning of Regulation (EU) 2017/745 (MDR) and do not serve any medical purpose. Statements regarding adhesion, wear duration, or water resistance refer exclusively to the respective sensors and manufacturer specifications.
Sources
Methodology: Manufacturer information (IFU/FAQ) and specialist literature were cross-referenced; in case of conflicting information, such as Guardian 4, this is indicated in the text. References are numbered after their first mention.
- Abbott. Sensors in Summer: Tips for Better Adhesion. FreeStyle Libre DE (Manufacturer's professional page). freestyle.abbott/de-de/artikel/sensoren-im-sommer.html · Accessed: 09.06.2026.
- Abbott. Bathing with the Sensor / Water Resistance of the Sensor. FreeStyle Libre Help-FAQ (Manufacturer/IFU). freestylelibre.de/hilfe/haeufige-fragen/sensor/baden-mit-sensor.html · Accessed: 09.06.2026.
- Dexcom. Can I get Dexcom G7 wet? Dexcom FAQ (Manufacturer/IFU). dexcom.com/en-us/faqs/can-i-get-dexcom-g7-wet · Accessed: 09.06.2026.
- Insulet. Omnipod 5 Automated Insulin Delivery System: Technical User Guide (Manufacturer/IFU). omnipod.com/sites/default/files/Omnipod-5_User-guide.pdf · Accessed: 09.06.2026.
- Medtronic. CGM & Sensors Product Support. Medtronic Diabetes (Manufacturer Support). medtronic.com/en-ca/diabetes/support/product-support/cgm-sensors.html · Accessed: 09.06.2026.
- Abbott Support. Does the FreeStyle Libre 3 (Plus) sensor contain IBOA? Abbott FreeStyle Support FAQ (Manufacturer). IBOA was removed from all FreeStyle Libre sensors in 2020; Libre 3 does not contain IBOA. support.freestyle.abbott/hc/en-us/articles/39979428421265 · Accessed: 09.06.2026.
- Dexcom. How do I keep my sensor on for the full 10-day wear? Dexcom FAQ (Manufacturer/IFU). dexcom.com/en-us/faqs/how-do-i-keep-my-sensor-full-10-day-wear · Accessed: 09.06.2026.
- Dexcom. How to treat irritated skin or rash from Dexcom adhesive? Dexcom FAQ (Manufacturer/IFU). dexcom.com/en-us/faqs/sensitive-skin · Accessed: 09.06.2026.
- Peeters G, et al. Preserving Skin Integrity with Chronic Device Use in Diabetes. Diabetes Technology & Therapeutics, 2018 (Peer-Review/Overview). PMC6011799. pmc.ncbi.nlm.nih.gov/articles/PMC6011799 · Accessed: 09.06.2026.
- Fraccalvieri M, et al. Allergic contact dermatitis caused by glucose sensors and insulin pumps: A full review. Part 1. Contact Dermatitis, 2024 (Peer-Review/Review). PMC11710928. pmc.ncbi.nlm.nih.gov/articles/PMC11710928 · Accessed: 09.06.2026.
- Herman A, et al. Allergic contact dermatitis caused by glucose sensors in type 1 diabetes patients. Contact Dermatitis, 2020 (Peer-Review/Study). ovid.com/journals/codr/fulltext/10.1111/cod.13337 · Accessed: 09.06.2026.
- Real JM, et al. Cutaneous Reactions to Continuous Glucose Monitoring and Continuous Subcutaneous Insulin Infusion Devices. 2021 (Peer-Review/Survey). PMC8258506. pmc.ncbi.nlm.nih.gov/articles/PMC8258506 · Accessed: 09.06.2026.
- Svedman C, et al. A case of contact dermatitis caused by isobornyl acrylate in FreeStyle Libre: the usefulness of film-forming agents. Contact Dermatitis, 2019 (Peer-Review/Case Report). researchgate.net/publication/330933371 · Accessed: 09.06.2026.
- Oppel E, et al. New device, 'old' allergens. Allergic contact dermatitis caused by glucose sensors and insulin pumps. Contact Dermatitis, 2024 (Peer-Review/Study). portal.research.lu.se/en/publications/new-device-old-allergens · Accessed: 09.06.2026.
- Arzneimittelkommission der deutschen Ärzteschaft (AkdÄ). Drug Safety Mail 2021-03 (Authority/Professional Info). akdae.de/arzneimittelsicherheit/drug-safety-mail/newsdetail/drug-safety-mail-2021-03 · Accessed: 09.06.2026.
- Kaatz M. Allergic to insulin pumps and glucose sensors: How to solve the problem in diabetes? mein-allergie-portal, 2023 (Specialist portal/Expert interview). mein-allergie-portal.com/kontaktallergie/3716-allergie-auf-insulinpumpen-glukosesensoren-bei-diabetes · Accessed: 09.06.2026.
```
