Why plastics? Low cost, reliability and absolute waterproofness. The DEGRE is a comfortable technical double mountaineering boot well suited for winter hunting, mountaineering and alpine climbs. Unique is Koflach's Y-Technology - a comolding two select polymers which provides both a rigid platform for climbing and a softer upper and ankle cuff for greater flexibility. Steel Roller Lacing makes adjusting lace tension easier for better foot retention. Asymmetrical Vario Cuff allows a more natural lateral movement plus greater fore-aft flex. On trail or snow traction, braking and shock absorption is provided by Vibram Dalaugiri sole which accepts all crampons. Woven insulated liner boot is suitable for winter mountaineering and some expeditions to 6K meters. We recommend sizing 1/2 size up to allow adequate toe room. Example if US 10.5 / UK 9.5 is your normal size, order up a UK 10 / US 11. Don't forget your Vapor Barrier Socks to keep your liners dry!