The Intuition Pro Tongue Liner is the stiffest tongue liner made by Intuition, and a great upgrade for performance alpine boots whose wearers are seeking the ultimate in comfort and performance. The Pro Tongue offers a thinner, softer toebox and lower volume tongue than many stock liners and can improve the fit in both the forefoot and instep areas. This liner comes with a removable 7 mm foam insert in the sole, which may be removed if using a custom footbed. We recommend having this liner heat molded by a professional bootfitter (like evo) if possible.