The Spirit 4 is the no-compromise freeride boot for both on and off-piste riding. Designed to be comfortable putting up a ski track or boot pack, but lock down like San Quentin for hard-charging, cliff-hucking, rail jibbing (hopefully not in the backcountry) nastiness. Compatible with all Alpine-Touring bindings. Throw in a Walk/Ski lever and four buckles plus a power-strap, and you have endless comfort options whether skinning, skiing, or hiking. Updated Intuition Liner makes the Spirit 4 a warmer, more comfortable, and more powerful boot. And don't forget that these puppies are Dynafit compatible.