Features of the Keen Women's Terradora Wintershell Boot Keen dry waterproof, breathable membrane 200g of Keen Warm Insulation for a comfortable -25f Fused tpu shell for light flexibility Molded collar for comfortsoft microfiber liner Dual-Density pu foam Footbed with arch support Low-Density eva Midsole caters to a woman's foot Contoured heel lock for stability Ess shank offers lightweight support Keen freeze rubber Outsole designed for cold-weather conditions 4mm Multi-directional lugs for traction