CompatibilityDesigned specifically for Whoop 4.0 fitness trackers, ensuring a perfect fit and optimal performance. Premium MaterialsCrafted from a blend of polyester, nylon, and spandex with zinc alloy components for durability and comfort. Adjustable FitWith a wrist circumference range of 150mm-232mm, this band accommodates a variety of wrist sizes for personalized comfort. Lightweight DesignWeighing only 13.6g, this band offers a barely-there feel for all-day comfort during activities and sleep. Easy to InstallationThe strap is easy to install and remove, giving your device a new look easily. Specifications: Material: Polyester, Nylon, Spandex, Zinc Alloy Dimensions: 232mm x 25mm Wrist Circumference: 150mm - 232mm Weight: 13.6g