1. Polyester 2. FOREFOOT OFFLOADING DESIGN:A 15degree design forces you to move your weight to heel and reduces forefoot pressure and pain when you have a foot injury or surgery, or other diseases such as metatarsal fracture, diabetic foot ulcer. 3. Multiple Sizes: This postop shoe has multiple sizes for you to choose, sole length (XS: 8.85'/S: 9.64'/M: 10.43'/L: 11.22'/XL: 12.20'), please follow the tutorial in the size chart to measure the length of your feet and choose the size that works for you. 4. MOVEABLE HOOK AND LOOP: It provides a wide range of height adjustment, which can provide a comfortable and effective function for both feet covered with bandage during injury and feet without bandage during recovery. 5. COMFORTABLE MATERIALS: The upper is made of medicalgrade breathable fabric, which will not be stuffy all day long, and the sole is made of nonslip rubber sole, which can be applied to various grounds.