Hurley Men's Phantom Free Elite Sandal Volt Sandal Hexagonal flex grooves are hot-knife cut into the outsole, wrapping the sidewall to enable more natural motion. Secondary hexagonal and horizontal cuts intersect the flex grooves for even greater flexibility. The heel and footbed mimic the shape of the foot, rolling with the ground to promote natural foot movement. Perforations enhance breathability Branding on the strap and heel for style Abrasion-resistant rubber outsole inserts for durability