Impact-absorbing OOfoam technology in OOFOS' advanced footbed geometry; OOfoam technology absorbs 37% more impact than traditional footwear; Unique footbed design reduces stress on knees, ankles and other joints; Rounded, cupped heel designed to enhance impact-absorption and stability with every step; Lightweight, flexible and packable for ultimate travel ability; MEGA midsole for added comfort; Closed-cell foam is machine washable and designed to minimize odor