The Auna incorporates a high rebound PU footbed coupled with an abrasion resistant forefoot strap. This sandal is built to be supportive and comfortable for long days on the water or land. It features our innovative TUFgrp outsole, a revolutionary patent pending design constructed from a specially formulated rubber compound. TUFgrp provides next level traction on flat and hard surfaces as well as wet and uneven terrain. TUFgrp is independently verified SRC rated to deliver next-level non-marking grip. Constructed of a high rebound polyurethane blend which conforms to the foot High abrasion rubber upper strap lined with neoprene for comfort textured durable comfort footbed TUFGRP Next level traction on flat surfaces and uneven terrain / SRC rated to deliver next-level non-marking grip Upper straps are reinforced underneath midsole for durability