Stock ski boot liners are slowly improving, but the Intuition DH Tongue DD 15mm Liners are in a different league altogether. Built with dual density heat-moldable foam for a balance of comfort, performance, and warmth, they provide a beautifully locked in fit that has to be skied to be believed. Once these puppies are dialed in, your heels aren't going anywhere. We recommend having these liners heat molded by a professional bootfitter (like evo) if possible.