Available in three sizes (20, 22, 26 mm), the UltraFit nylon strap is extremely lightweight, breathable, easily adjustable and durable. The design is equipped with a Velcro fastener on both sides, which allows compatible smart watches to be quickly and easily adjusted to different wrist sizes. The elastic, two-layer, antimicrobial nylon fabric provides a high level of comfort and allows moisture transport during sports.