World-renowned "Mickey Boots" are 100% rubber, with thick wool insulation. Add in an insulating air pocket, all sandwiched between the layers of rubber. Rugged nylon laces go through the second eyelet twice to lock your foot in place. Gusseted tongue, heel wedge accepts ski or snowshoe bindings. Nylon lined. Has high-traction soles and heels, and double-thick rubber in all wear areas.