With Gore-Tex Infinium™ Windstopper fabric the Montane Windjammer Alpine Beanie does exactly what the name suggests, namely stops cold winds penetrating this outdoor hat and keeping your head and ears warm. This lightweight, full Gore Windstopper beanie hat is a technical piece of headwear for use in extreme conditions. It has a low profile, a close fit and delivers 100% windproof protection. Montane Windjammer Alpine Beanie Features: Gore-Tex Infinium™ Windstopper Fabric Lightweight Fleece Pile Backer Die-Cut Perforations Over Ears for Improved Audio Flatlocked Sewn Seams Throughout Weight: 34g