Description of Mammut Mamook GTX Mountaineering Boots The lightest crampon compatible mountain shoe for technically demanding climbing. This lightweight made from abrasion resistant Microfibre Racing and Dropstop textile provides great flexibility and has strong lateral support, thanks to integrated Mammut®Motion Control. Cushioning Hybrid Shell supports exactly and only where necessary. Asymmetric lacing takes the anatomy of the foot into consideration and means more pressure and precision on your big toes. The waterproof Gore-Tex® Insulated Comfort Footwear membrane, the very grippy Vibram® Teton sole with carbon insole, the situationally-individually adjustable 3 Zone Lacing system complete this quality shoe. Features: Carbon shank Crampon compatible 3 Zone Lacing Ortholite® Footbed Micro Hybrid-Shell Motion Control® Sole Footwear vibram® Teton, Poro wedge Fabric leather 1 Microfibre Racing Fabric textile Textile Lining GORE-TEX® Insulated Comfort Footwear Weight in g 1720 g Size UK 8.5