Breathable 4-way stretch upper for mobility; Pillowed heel cushions Achilles; Engineered knit collar and lacing system for a perfectly refined fit; Antimicrobial footbed lining; Rounded OOfoam heel geometry designed to enhance impact absorption; Deeper flex grooves for increased traction and longevity; Reduces stress on sore feet, knees, and back; Minimalist construction for light weight; Enables more natural motion; Machine washable, plus moisture and bacteria resistant