DESC: Rated to -25 deg. The Bella Alta is a stylish and feature packed way to walk through winter. Waterproof breathable Hyvent membrane and Primaloft insulation ensure a dry, warm answer to the elements. Easy on-off thanks to the locking rear zipper. Excellent traction with a Winter Grip outsole. UPPER HyVent waterproof membrane 200 g Primaloft insulation 1.6-1.8 mm waterproof nubuck Australian shearling sheepskin collar Double-adhesive latex seam-sealed construction AgION antimicrobial dual-density X-2 footbed Locking rear zipper for easy on-off and streamlined appearance BOTTOM Cushioned, lightweight CM EVA midsole 2/3-length nylon shank TNF Winter Grip rubber outsole.