Sensor3 Concept for Unprecedented Feel and Power * True Fit Liner Matches Internal Shell Perfectly for Great Out-Of-The-Box Fit * Articulate Heel Pocket for Superior Hold and Energy Transfer From the Foot to the Boot * One Piece Toe Box and Tongue Eliminates Seams which Cause Pressure Points Around the Toes, Ensures Warmth and Comfort * Soft Instep Pocket for Additional Comfort and Circulation to the Toes