Description of Vasque Radiator Mountaineering Boots A super-light, low-profile double boot for high altitude, multi-day alpine ascents and cold weather ice climbing. The shell features a Boa Technology closure, flexible and abrasion-resistant SuperFabric upper, and nanotechnology Aerogel insulation package. Features: Upper: TecTuff PU Leather Upper: SuperFabric Fabric Insole: Carbon Fiber Midsole: Dual-Density EVA Outsole: Vibram Mulaz Footbed: Dual Density EVA Full rubber Rand Crampon Compatible