This WHOOP compatible band is wrist wearing ONLY , its not for bicep wearing. Compatible Design: Specifically crafted for Whoop 4.0 , ensuring a secure and precise fit for all your activities. Premium Silicone Material: Made from high-quality, durable silicone that is soft, lightweight, and gentle on the skin for all-day comfort. Sweatproof & Washable: Designed to withstand intense workouts; easily washable to keep your wristband fresh and hygienic. Adjustable & Secure Fit: Features a flexible sports loop strap for a customizable fit, ideal for both men and women.