Klim Arctic GTX Boot With 1200 Gram Thinsulate Insulation, the Arctic Boot is our warmest boot and is GUARANTEED TO KEEP YOU DRY. GORE-TEX membrane is located on the outside of the insulation preventing the insulating material from absorbing water. This boot also features 600 Gram Thinsulate Insulation embedded in the midsole to protect from direct thermal transfer into the ground. Working in combination with synthetic moisture-wicking Klim socks, this boot will keep your feet warm and dry in the harshest conditions. Feature GORE-TEX product technology GUARANTEED TO KEEP YOU DRY 1200 gram Thinsulate increases warmth Thinsulate located inside gore-tex for maximum warmth and to prevent insulation from absorbing moisture 600 gram Thinsulate embedded in mid-sole Dual durometer sole construction for max traction in varied conditions Kicker toe piece resists wear from tunnel bolts Stiff durable board to help disperse shock protect bottom of foot Multi-layer substructure constructed from perforated materials increases overall breathability Moisture-wicking liner materials Ankle cutout promotes forward flex High quality, flat anti-slip, moisture-resistant laces Removable moisture-wicking insole Internal eva foam to cushion top tips of toes Anchored lace loops for synch-down power