【Product Details】 ・Size: M (50-56cm) ・Color: Black ・Material: Nylon Mesh (80% Nylon, 20% Polyurethane) 【Standard Swim Cap】A must-have swimming cap for sports gyms and public pools. Recommended for a wide range of swimmers, both men and women. Features the Speedo logo on the front of the cap. 【Fit】Durable and provides a secure fit. Designed to stay on and feel less constricting, making it suitable for various situations such as outdoor pools and swimming lessons. 【Quick-drying & Lightweight】Unlike competitive swimming silicone caps that prevent water from entering, mesh caps are characterized by their quick-drying and lightweight properties. Suitable for daily training. 【FINA Approved】Enjoy the high quality of Speedo swim caps at an affordable price. With a wide variety of colors available, you're sure to find the school-specified colors for swimming classes. I am selling this because the size didn't fit.