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.
40mm: S/M & M/L straps fit 130–200mm wrists. 44mm: S/M & M/L straps fit 140–210 mm wrists.
You can match this strap with any Apple Watch Series 4 case of the same size. It also works with all previous versions of Apple Watch, including Apple Watch Series 3. The 40mm strap works with the 38mm case; the 44mm strap works with the 42mm case.