Bubble Design Soft Silicom Waterproof Swimming Cap for Long Hair Women and Men Good quality and soft silicon material,more comfortable when you swimming. With high elasticity,can extend to 2 times of the oringinal size,and fit the head more tightly. Round shap design make it low Resistance when you are in the water. Use the cool water clean the cap after every use. To keep the cap durable,Pls donnt keep this cap long time stay behind the sun.