Being the stiffest, most aggressive offering in K2's line of Women's specific boots, the Spyre 110 LV Ski Boot is for the hard charging skier that demands a stiff and responsive feel from their boots. The Spyre has a women's specific last that checks in narrow at 97mm, so you don't have to worry about fighting a sloppy fit when you're sizing up tough lines. In addition to the narrow last, the Spyre also fits more narrowly in the heel to reduce heel slop, has less volume throughout the shell and cuff, and the cuff sits 15mm lower than K2's men's boots for a better fit around the calf. The Spyre may be smaller than K2's guy's boots, but it still packs a punch thanks to its four buckles, 35mm power strap, and K2's E3 design philosophy. Basically, E3 technology incorporates the carbon infused Powerfuse Spyne with the interlocking shell and cuff to deliver a more efficient forward flex and increase lateral stiffness, which in the end means a more responsive feel and better power on just about any terrain or snow conditions you encounter.