Our Biofuse Volume Cap has an extra-large capacity designed to accommodate voluminous hair. Made from soft, stretchy elastomeric silicone for maximum comfort, it includes a textured inside to grip the hair for a secure fit. Easy to put on and take off, it helps protect the hair against chlorine whilst creating a smoother profile in the water. Choose from two cap sizes: Size Large provides a 94% increase in volume vs our Silicone Moulded Cap. Size XL provides a 154% increase in volume vs our Silicone Moulded Cap.