- TuneLug™ engineered outsole with Vibram ® Megagrip™, Litebase™, and Traction Lug™. - Euforia™ super foam midsole with a proprietary PEBA/EVA blend for cushion and rebound. - Rippy™ 66 high-tenacity monomesh upper for breathable structure. - Asymmetrical lacing system to relieve Achilles and big toe pressure. - Dual-width form: D-width heel, E-width forefoot to accommodate natural expansion. - Serrated laces for a secure, stay-tied fit.