Compatible Models Designed specifically for WHOOP 4.0 and WHOOP 3.0 fitness trackers. Note: Fitness tracker not included. Soft Silicone Material Crafted from quality, skinfriendly soft silicone to minimize irritation and provide allday comfort. This material is lightweight, flexible, and durable, making it ideal for active use. It is sweatresistant, dustproof, dirtproof, odorless, and resistant to fading, ensuring a clean and fresh look even after frequent wear. Easy Installation Simple and tool installation. Align the holes on each end of the band with your WHOOP tracker and secure with a single press. Locks firmly to prevent loosening or detachment during use. Specifically designed for WHOOP 4.0 for maximum compatibility and secure fit. Fully Adjustable Size Equipped with sturdy hook and loop fasteners for quick and precise adjustments, providing a snug fit for wrist sizes from 6.1 inches to 7.5 inches (155 mm to 190.5 mm). Suitable for both men and women, with a sleek and versatile design that complements any style. Practical Use Scenarios Ideal for daily workouts, whether at the gym or at home, thanks to its secure fit and sweatresistant properties. for outdoor activities such as hiking, cycling, or running, offering both comfort and durability. Suitable for casual everyday wear, travel, or sleeping, providing comfort without compromising performance. GiftReady Design Makes a thoughtful gift for fitness enthusiasts, family, and friends for occasions such as birthdays, Christmas, Valentine's Day, Thanksgiving, or other holidays. This band offers a dependable, comfortable, and stylish solution for WHOOP 4.0 and 3.0 users seeking performance, durability, and ease of use in all facets of their active lifestyle.