Sun-San Sweetheart Sandals. A beautiful sandal with scalloped edges and heart shape cut-outs. The Sweetheart is a fully adjustable double buckle sandal with both toe and ankle straps. Did we mention that the Sweetheart sandal is fully waterproof? The entire Sun-San range comes on a spongy urethane soft sole with rust proof buckles and can be worn in water and handwashed with a gentle detergent.