Pre-formed anatomical Uni-Body traditional construction. Lightweight HyperLite composite quarters with new metallic mesh. Padlock molded anatomical ankle shape, locks down the heel for increased power. Bio-Dri woven microfiber lining. Lightweight, injected outsole. InTS Integrated Tendon Structure is comfortable and functional. Injected abrasion guard in high wear areas for added durability. The 777 is a Source for Sports exclusive & has been enhanced with the S12 tongue and LPS2 runners.