Sorel - Stoyoma Mountain (Bittersweet) - Men's: Seam-sealed,waterproof nubuck leather. 600g Thinsulate(tm) Ultra. Dri-Lex(R) fleece lining. Removable 9mm EVA comfort footbed. EVA midsole inserts. Injection molded, waterproof thermal rubber shell. Rubber multi-directional lug outsole. Sorel Rated: -40F/-40C.