Compatible Models and Size Trail Loop Sport Straps are compatible with Apple Watch Ultra/Ultra2 band 49 mm; iWatch 46 mm, 45 mm, 44 mm, 42 mm, 41 mm, 40 mm, 38 mm; iWatch SE/2nd Generation; Series 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, all versions. Note: Watch not included. Size 41/40/38/42 mm: suitable for wrists from 5.3' to 8.5' (135 mm to 215 mm). Size 49/45/44/42/46 mm: suitable for wrists from 5.7' to 8.9' (145 mm to 225 mm). Durable nylon strap Made of quality, skinfriendly nylon textile material. Features a sturdy metal buckle and adapters. Durable, comfortable, breathable, washable, and designed for a secure fit on the wrist. Quick and easy adjustment Loop closure allows quick adjustments on the go, even during workouts. A pull tab enables infinite adjustment to achieve an fit. Ensures the band stays in place during workouts or outdoor adventures. For all occasions Suitable for a wide range of indoor and outdoor activities including leisure, travel, work, sports, cycling, camping, and adventures. Wear the Apple Watch band anywhere, outdoors, in the gym, at the beach, and beyond. Use scenarios Fitness and outdoor workouts: secure, adjustable fit that stays in place during runs, cycling, or gym sessions. Outdoor adventures: comfortable for hiking, camping, and everyday outdoor activities. Everyday wear and travel: reliable comfort for work, commutes, and leisure throughout the day.