Crafted from lightweight, breathable nylon, this band is perfect for workouts and every day wear Compatible with Apple Watch Series 1-6 & SE Material: Nylon Size: Fits 160mm - 200mm wrists (6.3" - 7.9") What Size Do I Need?If you look at the back of your watch, you'll see what series and size you have. Then, simply select the correct option from the dropdown Wrist Size: 160mm-200mm (6.3in x 7.9in) Band: 42mm(1.6in) 38mm(1.4in) 44mm(1.7in) 40mm(1.5in) Compatible with Apple Watch Series 1, 2,