Your Apple Watch gets a sporty and casual appearance with the Apple Watch 38/40/41mm Silicone Watch Strap Sport Midnight. The strap is made of fluoroelastomer, a strong and water-resistant material. You can safely keep this watch strap on when you go swimming. Sweat also won't damage the watch strap and you can easily clean it after your workout. Thanks to the pin closure, you can easily adjust the watch strap to your wrist circumference. The end of the watch strap never sticks out, as you can tuck it behind the strap. The pin closure ensures the Apple Watch stays tightly around your wrist. This original Apple watch strap is suitable for the Apple Watch 38, 40, and 41mm and is suitable for a wrist circumference of 13 to 20cm.