PRO TONGUE liners are the first tongue style liners Intuition created that can compete with the Power Wrap in stiffness. They’re ideal for most shells used by intermediate and advanced level skiers and riders. This high-density, medium thickness liner features a 2mm Strobel sole, with removable 7mm foam insoles, and a roomy toe box to accommodate various foot volumes and widths in tighter fitting shells. The Pro Tongue is a medium volume liner and works best with a shell fit* of One – two fingers (1/2″-1¼”) If your shell is a half size, round down for this model. For best results we recommend having these liners heat molded at a shop by a professional bootfitter. Stiffer models require more attention when heated, while others can be easily molded by using the home fit kit.