Compatible with all Apple Watch models Designed for wrists 5" to 8.5" in diameter.
SIZE GUIDE
The Apple Watch band has 4 size options. And each size option has 2 parts, band size and case size.
Band size: Band length (S/M 7.5" or M/L 8.0") x band width (S/M 0.75" or M/L 0.8")
Case size: 38mm-41mm case or 42mm-49mm case