Overlays that are composed of PU films or PU non-wovens provide a barrier against moisture, contaminants, and mechanical stress while maintaining breathability and conformability to the skin. 

To effectively cover a device, it is essential to select an overlay or cover tape that offers robust device protection. This material should not only adhere securely over the device but also provide a protective barrier against environmental factors such as moisture, dust, and mechanical stress. The materials chosen for the overlay or cover patch should be durable and flexible, capable of conforming to the device's contours while maintaining its protective properties. It is important to consider the patch's compatibility with the device's surface, ensuring that it can be applied and removed without damaging the device or leaving residue.

When protecting medical wearable devices with an overlay, experts often recommend using polyurethane (PU) films or polyurethane (PU) non-wovens, as they provide a barrier against moisture, contaminants, and mechanical stress while maintaining breathability and conformability to the skin. Additionally, these materials offer excellent durability and flexibility, enhancing the overall protection of the device without compromising wearer comfort or adhesive performance.

Combining these materials judiciously based on specific device requirements and user needs ensures optimal protection and functionality of medical wearable devices.