Check the listing for details. Silicone Loop Band Compatible with Whoop 4.0 Sports Wristband Band Replacement. Color: Black, Condition: New. Listed at 18.99 USD. COMFORTABLE & SKIN-FRIENDLY: Our Silicone Loop Band for WHOOP 4.0 features a soft-touch design made from non-irritating, odorless material, providing all-day comfort for your active lifestyle. (This silicone wristband does not interfere with charging and does not need to be removed) WATERPROOF & SWEATPROOF: Whether you're hitting the gym, going for a swim, or running in the rain, this band is completely waterproof and sweatproof, allowing you to focus on your performance without worry. SECURE & DURABLE: The innovative loop back studded buckle ensures a snug and secure fit, so you can wear your band for WHOOP 4.0 band confidently during intense workouts or competitive swimming sessions. LIGHTWEIGHT & ADJUSTABLE: Designed for versatility, the lightweight construction makes it easy to wear.