[Compatible Model] The sports watch strap is compatible with the Apple Watch 42mm 44mm 45mm 49mm, and is compatible with the iWatch Series Ultra SE 8/7/6/5/4/3/2/1. Please check the size on the back of the watch and choose the same size. [Soft, waterproof, and skin-friendly] The silicone strap is made of soft and smooth silicone, which is durable and lightweight. It is non irritating, anti slip and anti perspiration. Wearing a silicone sports watch strap provides a comfortable and unrestrained wrist feel. NKWB-11 type [Air hole design and secure installation] A smart watch strap replacement that is compatible with the Apple Watch/iWatch strap has perfect lugs, allowing for seamless and secure locking by simply connecting both ends of the watch, making your smart watch even safer. [Various Colors and Sizes Available] This sports smart watch strap comes in a variety of colors and sizes: 42mm/44mm/45mm/49mm - S/M: Suitable for wrists ranging from 140mm to 190mm (5.5 inches to 7.5 inches). [Luxury Style Design] A variety of sports and fashion smart watch straps are available to choose from, making your smart watch look fashionable and an ideal Christmas gift for family and friends. It is perfect as an accessory for sports, business meetings, and parties, suitable for women, men, boys, and girls.