evo.com | Full Tilt Ski Boot Parts > Refresh your boots with the soft, forgiving flex of the Full Tilt Tongue Flex 4. Includes a pair of Flex 4 tongues that's compatible with Full Tilt's Original and Soul shell styles (see Compatibility below). Shell Compatibility Original (FTO) / Soul (FTS) What's Included 2 Tongues (Comes as a pair) | Full Tilt Tongue Flex 4 - X-Large in White