Ordered a 58cm and when it arrived it was too large for my head, also compared to original C Caps it sits wrong no the head. After 3 high temp washes it has shrunk the correct size and wears a little better.
However for the price you can really go wrong.

Houston - UK

Delighted to find one of these for sale. A great addition to my collection.

McCabe - LU

Great hat, good quality, fast shipping, but order at least one size up from your regular size.

Muir - CA