A cap that slips right on to your mask strap! The patented design gives a thin layer of protection to your head, without being bulky or restrictive.  Works to hold bangs back and hair from slipping out of a ponytail and in to your mask or vision.  Wear your ponytail or braid low, or high through the opening in the back.  Keeps mask straps tucked away neatly, and protects your strap clasps from popping open.  82% polyester/18% spandex, 4-way stretch material provides for a one-size fits most, and will hold it's stretch well in the water.