An exceptional boot for mountaineering at altitude, the G5 gives performance you can rely on. Combining the thermal insulating characteristics of a double boot with the lightness & low volume of a single boot, it's well suited to winter alpinism.A water-repellent, abrasion resistant Cordura gaiter protects the insulated inner boot, which is adjustable via the Boa Lacing System. Together they provide warmth, security & weather protection in a design that is quick & easy to fit. Superlight PU Tech Lite on the rand & carbon fibre in the midsole help shave weight & bulk, while still providing the durability & performance needed to succeed in harsh mountain environments.