NWT - Box hasn’t even been open! I bought another watchband, so I can’t use this. Product Information Overview 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. Material: Fluoroelastomer Compatibility Apple Watch Models 38mm 40mm 41mm 42mm