The Brand Felt Ltd. Boot Liners 816 GWR - 10 inch Height Silver 80%wool blend/20%synthetic fibers Please refer to the size chart in the image gallery and NOT Amazons sizing info Made of Entirely Wool Felt Lining Features RadianTex(TM) Exterior to Reflect the Cold Reinforced Heel Height is an approximation, see size chart in image for accurate measurements and see description for boot suitability!