Built on our proven foundation of OOfoam(TM) technology. Enhanced with NEW features developed to improve impact absorption and recovery. From plush heel-strike to easy toe-off, OOfoam(TM) will have you finding your stride in top form. Call-outs: Breathable 4-way stretch upper for mobility Pillowed heel cushions Achilles Engineered knit collar & lacing system for a perfectly refined fit Antimicrobial footbed lining Rounded OOfoam(TM) heel geometry designed to enhance impact absorption Deeper flex grooves for increased traction & longevity