On the lookout for stunning sandals to stand out this summer? Introducing the Strong strappy flats. These gorgeous sandals mix function and fashion to ensure you stay comfortable and looking your best all day long. Pair with a cardigan and jeans for an everyday look. The Strong flats are made with a synthetic inner, upper, lining and outsole. Step out in style with a pair of Strong sandals. Synthetic Upper, Lining and Outsole.