Merrell Women's Siren 4 Thermo Mid Zip Waterproof BootsNo matter the weather conditions, your feet will remain warm and dry in these Siren Thermo boots. Waterproof full grain leather and knit upper Abrasion resistant protective rubber heel and toe cap 200 grams Primaloft Gold Eco Series synthetic insulation. SOLAR CORE insulation with Aerogel for superior underfoot warmth Removable PU footbed made with 5% recycled materials FloatPro Foam midsole Vibram Icetrek outsole for improved grip on ice and snow