•Our exclusive Heatwave thermodynamic lining as a comfortable, 4-way stretch sock lets you increase the heat of any footwear
•Flat seam, form fitting construction
•Reinforced stitching for lasting strength

•Mens Shoe Size: S(<6) M(6-8.5) L(9-11.5) XL(11.5-13)
•Womens Shoe Size: S(<7) M(7-9) L(9.5-12)