BUILT FOR HIGH PERFORMANCE – The WHOOP SportFlex Accessory Wristband 4.0 is a breakthrough band made from waterproof, sweatproof, and dirtproof silicone. It’s highly durable and designed to withstand the most intense workouts and sports. MADE WITH SOFT-TOUCH SILICONE – Not only is the WHOOP SportFlex Accessory Wristband 4.0’s silicone material exceptionally durable, it’s also ultra-smooth, hygienic, and easy to clean. Small scuffs can be wiped off, or you can deep-clean the band with isopropyl alcohol and a lint-free cloth followed by a water rinse. ADJUSTABLE & BREATHABLE – The WHOOP SportFlex Accessory Wristband 4.0 is made with an adjustable closure system to ensure a snug, secure fit, no matter how intense your workout. The band includes ventilation details, making it extra breathable and comfortable. 100% WATERPROOF – The WHOOP SportFlex Accessory Wristband 4.0 is completely waterproof, making it an essential accessory for everything from swimming laps and surfing to high-sweat, high-intensity workouts. EASY TO INSTALL – The WHOOP SportFlex Accessory Wristband 4.0 is easy to install and remove, making it a convenient accessory for those who want to switch between different styles. Includes band, hook, clasp, and Fast Link slider that makes swapping bands easier than ever. Only compatible with WHOOP 4.0