I bought these for a climb that required double boots. Tried them out for 10 minutes on my driveway, then the climb was cancelled. Put them away thinking I'd do another 6000 m climb one day....it was not to be. Here's the product blurb from the REI website:
"The La Sportiva Men's Spantik Mountaineering Boots give you warmth for high-altitude and winter mountaineering and the agility to send difficult ice and mixed pitches. The synthetic outer boots increase flexibility and help reduce weight to a low 5lb 1oz per pair. Heat-moldable, removable liners give the Spantik Mountaineering Boots a precise fit to ease foot fatigue and minimize heel lift when you front point steep ice. La Sportiva knows what it feels like to lace boots while you wear gloves, so they invented the Fast Lace System, which lets you cinch down these boots with a single pull—even with gloves. Mountaineering boot made for 6000-7000 meter peaks; Thermo-molded inner boot and micro-cellular insulation for warmth; Both shell and removable liner have Lorica weatherproof treatments; Glove-friendly closures at both inner and outer boots; Insulated footbed and triple-layer midsole assures underfoot comfort; Vibram Montagna sole with step-in crampon compatibility."
Keywords: Double Boot, Mountaineering,