Highly innovative insulated boot with removable inner bootie. An excellent alternative to the old fashioned double plastic boot. Ideal to climb north faces, winter alpinism and for long periods in high elevations. The new outer boot, with Instep Overlap technology, allows an easy, comfortable and precise fit. This model features an innovative lacing system (Patent Pending), both for the outer and the inner boot, designed to allow closure with only one hand, in extreme conditions with gloves. Very light, a pair size 42 weights only 2300 g.