The Pow face mask uses Gore Infinium material, introduced a few years ago. This fabric provides full wind protection while remaining highly breathable. The inside features a soft, fleece-like surface. Thanks to snap fasteners, the mask is easy to remove, even when wearing a helmet. It is a Bluesign-certified product and contains recycled polyester. Choose the size of the face mask similar to how you would choose the size for a shirt or beanie. If sizes S or M are usually right for your other clothing, they will typically work for this face mask too. If you generally wear larger sizes, its better to opt for M/L.