Stretchy Nylon Bands are compatible with Apple Watch models 49mm watch bands compatible with Apple Watch Ultra41mm or 45mm watch bands compatible with Apple Watch Series 841mm or 45mm watch bands compatible with Apple Watch Series 740mm or 44mm watch bands compatible with Apple Watch SE(1st and 2nd generations),Series 6,Series 5 & Series 438mm or 42mm watch bands compatible with Apple Watch Series 3, Series 2 & Series 1 One-Step Installation & Removal There are smart watch lugs on both ends, which can fit the watch interfaces perfectly. It just needs one step to install and remove the watch. Soft, Stretchy & Breathable The smart watch bands are made of durable nylon material.They are soft,skin-friendly, stretchy and breathable, offering a comfortable wearing experience to you. Adjustable Buckle & Sturdy Hook & Loop Fastener The wrist bands are designed with adjustable solo loop buckle and sturdy hook & loop fastener, which makes them adjustable to fit all wrists. The 38mm/40mm/41mm Size is fit for 5.1"-7.5" (130mm-190mm) wrists,the 42mm/44mm/45mm Size for 5.7"-8.7" (145mm-221mm) wrists.