Apple 40mm Sport Band - Strap for smart watch - S/M & M/L size - beryl green - for Watch (38 mm, 40 mm, 41 mm). 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.