Merrell M Coldpack 3 Thermo Mid Boot Muck This lining adds extra insulation Color:HV1 Drk Hbr Tl Hthr This lining adds extra insulation to keep cold out for kids that want to stay outside playing in the snow all day Blundstone patented Shock Protection System (SPS) disperses shock at heel strike and reduces skeletal stress absorbing up to 90% of the impact as you walk With 200 grams of insulation and a fleece lining your feet will stay warm when the temperatures dip The waterproof construction and and Vibram Arctic Grip underfoot with keep you dry and deliver traction in any conditions mother nature can throw at you