THE NORTH FACE Work Cap GORE-TEX Product Number: NN02100 Color: Navy Size: M Material: Outer: 100% Nylon (Resin Coating), Inner: 100% Nylon *Size Reference* According to the manufacturer's size details, size M is 56-58cm. However, the wearer usually wears a 59cm hat, and this cap fits just right to slightly loose. By the way, I initially purchased size L, but it was too big. Worn twice. I have two of the same item, so I'm selling this one. I would appreciate it if you could understand that this is a used item. Please note that it will be folded compactly for shipping.