Made of silicone which provides a smooth surface that streamlines the head for reduced drag and enhanced performance. The elastic swimming cap can keep your hair dry, prevent it from cold water, isolate the hair from the water, and provide you with a safer and more joyful swimming experience. Swim cap is suitable for any occasion where you can swim (swimming pool, open water, shower field). Price listed is for 7.5″Lx8.66″W, welcome inquiries for more size(7.87″Lx9W, 7.87″Lx9.65″W) we have. Orders of 5000 pieces or greater are eligible for sea shipping. 100% guarantee for quality.