The Chaco Mega Z Classic Sandal pairs a podiatrist-certified LUVSEAT footbed with a non-marking ChacoGrip rubber outsole. Its 1. 1 inch polyester jacquard webbing runs through the midsole and wraps the foot, with REPREVE recycled webbing adding durability. What Our Gearhead® Experts Are Saying:“I adjusted the single strap around my whole foot once, and the wider straps' extra points of contact held it in place through a full day of walking and light trail miles.”