Weekend Pick Box Knot Mid Heel Sandals. The sandals are simplistic but with a fun twist of a box knot strap in the front. The sandals can be used for casual as well as formal wear as the cushioned insole offers comfort. Outer material: Polyurethane Lining Material: Polyurethane Outer sole: TPR Open Square Toe Kitten Heel Box Knot Front Strap Pin Buckle Fastening Casual Women's Sandals SH3101