Blundstone 566 The Winter Thermal Chelsea in Black. A winterized Blundstone boot for total comfort in the coldest months. 100% wool fleece footbed, Thinsulate™ lining, 100% waterproof—even the elastics! Premium waterproof leather. Fully waterproof boot with waterproof elastic and latexed seams. Lined with 200 grams of Thinsulate insulation. Thermo-urethane outsole resistant to hydrolysis and microbial attack. Polyurethane midsole for comfort. XRD™ in the heel strike zone to dissipate heel strike shock. Removable sheepskin footbed for warmth and comfort. XRD™ in the heel pad. Extra set of footbeds. Leather lined (Classic). SKU: 566 Blundstone Unisex Classic Winter Boot 566 - Black