Merrell Siren 4 Thermo Mid Zip J037412 Wos Women's Slippers Developed for all day comfort 88800061396 Developed for all day comfort A full grain leather upper in natural tan encases the foot in a breathable natural material protected by a Vibram out sole produced using 30% recycled rubber With 25 years of Merrell's women's specific fit YKK medial zipper for easy on and off • Bellows tongue keeps out debris • Protective and abrasion resistant rubber heel and toe cap • 100% recycled fleece lining • 200 grams Primaloft® Gold Eco Series synthetic insulation • SOLARCORE® Aerogel insole provides underfoot superior warmth while being extremely flexible and ultra thin • 100% recycled mesh footbed cover • Cleansport NXT™ treated for natural odor control • 5% recycled removable PU footbed • FloatPro™ Foam midsole for lightweight comfort that lasts • Vibram® Icetrek outsole designed to provide the improved grip on very cold