Large size with ear pocket provides extra comfort.
External convex prevent goggles strap slip.
If you are an open water swimmer this large hat will be your perfect second hat.
The ear pocket also provides extra space for your waterproof headphone.
Rinse the hat with clean water after the pool or open water swim.
Use your towel to dry both inside and outside and turn inside out when not in use.
If you are not going to use the hat for a long time, use a small amount of baby power put on both sides of the hat and keep it in a dry and cool place.