Optisensor 3D Liner

OptiSensor 3D liners deliver a new level of optimized foot wrapping, comfort and support. Strategically placed materials in three-key fit zones maximize the interaction between the foot, liner, and shell. Softer ankle and instep areas increase comfort and foot wrapping. A stiffer heel cup provides superior heel lock, increasing support and control for enhanced performance. New Thinsulate™ lining increases warmth for all-day comfort. Impressive "out-of-the-box" fit with unparalleled performance.