Crisscrossing straps run up the sides of the cozy Women's HOODOO III Lace Up Boots form Keen, so you can wear them as loose or tight as you like. They're insulation with KEEN.Warm, lightweight insulation that keeps you warm during long, cold winters. The durable sole is designed to grip snowy, icy surfaces. The Thermal Heat Shield Footbed has woolly softness on the outside, support cushioning in the middle, and a thermal foil barrier to harness radiant heat on the inside. Keep the cold out and the heat in this winter with the HOODOO III.