Ribelle Tech 2 mountaineering boots. 0 HD is the next evolution of Scarpa's unrivaled alpine boot , light and maneuverable but created for mountaineering. Updates include new asymmetrical lace closure built into synthetic upper HDry waterproof membrane with low volume and high breathability as well as more durable integrated gaiters with construction adjacent to the toe. Insulated Primaloft Gold lining prioritizes the forefoot and the center and back of the boot are lined with Primaloft Silver insulation. All in all, these are lightweight mountaineering boots. which are convenient on long approaches durable and warm enough for difficult terrain and maneuverable enough to take us from the valley to the saddle and the summit.