Big Star's extremely lightweight snow boots are made of a combination of ecoleather and textile material. Inside insulated with a pleasant to the touch shoe cover. Velcro fastening. The Memory Foam System insole remembers the shape of the foot, ensures a proper fit, absorbs shocks and is resistant to deformation. The structure of the foam allows moisture to evaporate and regulate temperature. When choosing a size, please refer to the size chart.3019/3119.5/3220/3320.5/3421/3522 cm.