Compatible with: Apple Watch Ultra 1 amp;2 49mm, Apple Watch Series 9, 8, 7 (45mm), Series 6, 5, 4 (44mm), SE (44mm), Series 3 (42mm). NOT compatible with 38mm, 40mm and 41mm. Wrist sizes: ranging from 145mm to 195mm No need to adjust the length everytime wearing it. quick release and convenient to put on secured with hook-and-loop closure and magnet buckle soft nylon band, rugged, lightweight, breathable and conformable to wear carefully curved stainless buckle makes the perfect fit and feel on wrist one size fits most, designed for wrist sizes ranging from 145mm to 195mm wide compatibility, work for Apple Watch Ultra 49mm, Apple Watch Series9, 8, 7 (45mm), Series 6, 5, 4 (44mm), SE (44mm), Series 3 (42mm).