The UltraFit nylon straps are lightweight, soft and comfortable to wear. They're made with an elastic dual-layer antimicrobial nylon weave that allows moisture to escape. The strap design loops around the pins and is secured via two sets of hook and loop fasteners at both ends of the strap, providing easier adjustability and a secure fit for a variety of wrist sizes (see your product specs tab for wrist circumference information). UltraFit nylon straps offer trusted performance and superior durability.Compatible Devices:- D2™ Bravo- D2™ Charlie- D2™ Delta PX- D2™ Mach 1 Pro- Descent™ Mk1- Descent™ Mk2i- Descent™ Mk3i – 51 mm- Enduro™- Enduro™ 2- Enduro™ 3- epix™ Pro (Gen 2) – Sapphire Edition 51 mm- epix™ Pro (Gen 2) – Standard Edition 51 mm- fēnix® 3- fēnix® 3 HR- fēnix® 3 Sapphire- fēnix® 5X- fēnix® 5X Plus- fēnix® 6X - Pro and Sapphire Editions- fēnix® 6X - Pro Solar Edition- fēnix® 7X – Sapphire Solar Edition- fēnix® 7X Pro – Sapphire Solar Edition- fēnix® 7X Pro – Solar Edition- fēnix® 7X Pro – Solar Edition (No Wi-Fi®)- fēnix® 8 – 51 mm, AMOLED- fēnix® 8 – 51 mm, Solar- Foretrex® 601- Foretrex® 701 Ballistic Edition- Foretrex® 801- Foretrex 901 Ballistic Edition- Instinct® 2X Solar- Instinct® 2X Solar - Tactical Edition- Instinct® 3 – 50 mm, AMOLED- Instinct® 3 – 50 mm, Solar- quatix® 3- quatix® 3- quatix® 6X Solar- quatix® 7X – Solar Edition- tactix® 7 – AMOLED Edition- tactix® 7 – Pro Ballistics Edition- tactix® 7 – Pro Edition- tactix® 7 – Standard Edition- tactix® 8 – 51 mm, AMOLED- tactix® 8 – 51 mm, Solar- tactix® 8 – 51 mm, Solar, Elite- tactix® Bravo- tactix® Charlie- tactix® Delta - Sapphire Edition- tactix® Delta - Solar Edition- tactix® Delta - Solar Edition with Ballistics