Aetrex Berries Sling Back Thong - Women's Leather Lynco orthotic footbeds for support, balance and alignment. Memory foam cushioning for customization and comfort. Aegis anti-microbial technology to help protect against fungi, bacteria and odor. Four way stretch uppers for optimum fit. Advanced polyurethane outsole for shock absorption and resilience. Stylish accents and stitching.