227749BLK_45 Features: Get a combination of rigidity and flex with Y-Technology, a combination of rigid plastic for support and secure crampon attachments and supple plastic in lacing areas Move more naturally with the Vario cuff articulation that allows more comfortable fore-aft and lateral flex Tough rubber rands absorb shock and provides a stickier surface for climbing Get the absolute comfort of a thermo-moldable Intuition liner to a classic and trusted liner that provides a customized fit with heat-trapping capability Lace up and get moving to the steel roller lacing allows you to quickly and efficiently tighten the laces Get a combination of rigidity and flex with Y-Technology, a combination of rigid plastic for support and secure crampon attachments and supple plastic in lacing areas UK Sizing Specifications: Weight per pair: 4 lb 12 oz Upper: selected polymers Midsole: EVA Outsole: rubber Insulation: thermo-moldable foam