Stock ski boot liners are slowly improving, but the Intuition DH Tongue HD 9mm Liners are in a different league altogether. Built with high density heat-moldable foam for the utmost stability and performance, they provide a comfortable, 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.