FKM fluoroelastomer rubber 100% waterproof Interior ventilation channels Custom stainless steel closure pin Designed for Apple Watch Series 7, SE, and all previous versions of Apple Watch Sport Slim Band is lightweight on your wrist but maintains the durability of a larger band. Made of flexible FKM rubber and designed with a low-profile pin-and-tuck closing mechanism, Sport Slim Band easily transitions from workout to workday. High Performance Sport Slim Band is made of FKM rubber that is both comfortable and durable. FKM’s natural flexibility allows the band to easily contour around your wrist and its resistance to oils allows you to easily wipe down the band after a workout. Workout Ready Get more out of your workouts with Sport Slim Band. Channels in the bottom of the band and full length adjustment holes increase breathability and flexibility. Slim Profile Sport Slim Band is thin and lightweight, but maintains the durability of a larger band. Whether you’re doing laps or running errands, Sport Band Slim rises to any occasion. Pin and Tuck Closure Sport Slim Band is finished with a custom-designed pin and tuck closure that is slim and secure. The stainless steel pin latches through the band while the tail end is tucked away neatly against your wrist.