Craft Adv Windblock Fleece Hat Properties: ADV Windlock is a winter hat made of knitted fabric that has a windproof membrane in the front part and a spacious construction that also protects the ears from wind and cold. VentAir Wind membrane in the forehead area fleece lining inside the head circumference ribbed structure shape of overlapping ears Composition: 100% acrylic 100% polyester Membrane - 100% polyurethane