The Thermal Pro is our warmest shoe cover that provides 360 degrees of customizable protection from the worst winter can bring. A seam-sealed 2 mm neoprene outer with a fleece-lined inner provides unparalleled warmth, a customizable under sole prevents anything from seeping up into your foot, and easy wide hook-and-loop fastener with puller and waterproof zipper and covered zipper garage keep the fouls of winter weather at bay.