I have worn one of these Niwaki caps for 3 years and find it indispensable. Mine has faded slightly in the sun but still remains a good colour. The cap is made from 16oz hard wearing cotton and has a red band on the inside of the cap. It is a one size fits all cap and achieves this via a metal clamp buckle at the rear of the cap which allows it to be tightened or loosened.
The only adornment to the outside of the cap is the Niwaki logo, printed in red and black.