Compatible with 38 millimeter, 40 millimeter, and 41 millimeter Apple Watch -- just slide into the watch case; fits Apple Watches including series 1 (38mm), series 2 (38mm), series 3 (38mm), series 4 (40mm), series 5 (40mm), series 6 (40mm), series 7 (41mm), and series 8 (41mm)
Made of polyurethane, a soft and flexible synthetic material that is more durable than rubber or plastic; stainless steel buckle
Extra long watch band: fits wrist circumference 6 to 9 inches (152 to 229 millimeters) when attached to 40mm watch; entire band measures 8 1/16 inches (205 millimeters) long
Waterproof; this watch band can be used underwater including for swimming and scuba diving
Watch strap measures 19 millimeters (3/4 inch) wide in most areas and wider near the ends where it attaches to the watch