Thank you very much for your interest in our many products! This is a KEEN sandal. ▪️Authentic product purchased from Murasaki Sports ★ The rubber straps on the instep firmly hold the foot in place. ★ The entire material is soft rubber and is molded to fit the shape of the foot, so it won't hurt. ★ Despite the fit and hold, it's made of rubber, making it easy to put on and take off, and stress-free. ★ These sandals are extremely comfortable and durable. ★ Made of rubber material, the cushioning lasts, providing a comfortable fit even for long periods. These sandals are perfect for everyday use, as well as for the pool and the beach. Please feel free to ask any questions!