Made from a custom high-performance fluoroelastomer, the Sport Band is durable and strong, yet surprisingly soft The smooth, dense material drapes elegantly across your wrist and feels comfortable next to your skin An innovative pin-and-tuck closure ensures a clean fit Apple Watch Sport Band includes 3 straps that can be configured for either S/M or M/L length. Regular Bands fits 140–210mm wrists and are compatible with 42mm, 44mm and 45mm Apple Watch Models