| Compatible Device | Dexcom G7 |
| Typical Overpatch Size | 60β75 mm Γ 60β75 mm |
| Centre Hole Diameter | 32β35 mm |
| Wear Duration | Up to 10.5 days |
| Water Resistance (film) | Shower & swim rated |
| Adhesive Type | Medical-grade acrylic |
Key Takeaways
- Dexcom G7 overpatches protect the sensor adhesive from peeling, sweat, and water exposure
- Correct sizing (avoiding the sensor bump) is critical for compatibility
- Medical-grade, hypoallergenic materials reduce skin irritation risk
- Overpatches can extend reliable wear from 10 to the full 10.5-day sensor life
- MDS Diabetes stocks a curated range of G7-compatible overpatches
Why Dexcom G7 Sensors Lift at the Edges
The Dexcom G7 uses a smaller, all-in-one transmitter-sensor design compared to its predecessors. While compact and discreet, the reduced adhesive surface area makes edge lifting a common complaint β especially in hot climates, during exercise, or for users with naturally oily skin. An overpatch is a secondary adhesive film applied over the existing sensor patch to mechanically reinforce it without covering the sensor bump or signal window.
Key Sizing Requirements for G7 Overpatches
The G7 sensor housing sits proud of the skin, meaning any overpatch must have a pre-cut centre hole (approximately 32β35 mm diameter) to accommodate the bump. Patches that are too small won't cover the lifting edges; patches without a centre cutout cannot be used at all. Typical overpatch dimensions for the G7 range from 60 mm Γ 60 mm to 75 mm Γ 75 mm overall.
Best Overpatch Options Compared
| Product | Material | Size | Water Resistance | Hypoallergenic |
|---|---|---|---|---|
| MDS Diabetes G7 Overpatch | Medical PE film | 70 Γ 70 mm | IP27 shower/swim | Yes |
| Dexcom Official Patch | Fabric/cloth | 60 Γ 60 mm | Splash resistant | Yes |
| Skin Tac + Tegaderm | Polyurethane film | Custom cut | High | Varies |
| Generic Fabric Patch | Cotton blend | 65 Γ 65 mm | Low | No |
Materials: Fabric vs. Film Overpatches
Polyurethane (PE/PU) Film
Thin, transparent film patches conform closely to the skin, offer excellent water and sweat resistance, and are nearly invisible under clothing. They are the top choice for swimmers and athletes. The MDS Diabetes G7 Film Overpatch uses medical-grade PE film with a gentle acrylic adhesive proven safe for sensitive skin.
Fabric / Woven Patches
Slightly thicker and more breathable, fabric overpatches suit users who experience maceration (skin softening) under occlusive films. They are less waterproof but comfortable for everyday wear in moderate climates. Dexcom's own branded patches fall into this category.
Application Tips for Maximum Adhesion
- Clean and dry the skin around the sensor before applying β remove any residual adhesive remover or sweat
- Apply a skin barrier wipe (e.g., Cavilon or Skin Tac) to the surrounding skin 30 seconds before placing the overpatch
- Align the centre hole carefully over the sensor bump before pressing down
- Press firmly from the centre outward for 30β60 seconds, paying attention to the corners
- Avoid applying immediately after showering β wait 10β15 minutes for skin pores to close
Managing Skin Sensitivity
Some users develop contact dermatitis from the original Dexcom adhesive. Overpatches can actually help by acting as a barrier between the adhesive edge and the skin. If irritation occurs under the overpatch itself, switch to a hypoallergenic medical film or use a barrier wipe beneath it. Always rotate sensor sites to allow skin recovery between sessions.
Where to Buy G7 Overpatches
MDS Diabetes (mdsdiabetes.com) offers a dedicated range of Dexcom G7-compatible overpatches, including film and fabric varieties in multi-packs. Purchasing from a specialist diabetes supplier ensures correct sizing, verified medical-grade materials, and expert customer support.