A warm snug hat plays a key roll in keeping you warm on the wintery trails this season so why not invest in the Stormlock hat by Jack Wolfskin for ultimate warmth and comfort. This beanie hat is fully windproof and breathable keeping the warmth in without over heating. It is made from recycled polyester with stormlock fleece to lock in the heat whilst you concentrate on staying upright on the cold trails., Beanie Hat. Windproof., Breathable. Knitted Look., Made Of Recycled Polyester. Weight: 120 G (Size L)., Recycled Polyester Fabric. Stormlock Fleece: Windproof Very Warm And Breathable Fleece., 100 % Polyester.