Within the specifications of most headwear items on Browning.com is the size specification listed as "OSFM." This means One Size Fits Most. All current Browning hats and caps are adjustable for head size with either a hook and loop fastener, snapback fastener, buckle adjuster, elastic, or some other adjuster. This is indicated within the specifications of each headwear product under "Size Range" (example shown).

Several Flex Fit hats will have a more specific size indicated for each hat, also found in the specifications listing for each hat under "Size Range." 

When the size is indicated as OSFM Browning caps, beanies, balaclavas, and other headwear are made to fit the most common head sizes within their respective categories (men, women).

OSFM -- Will fit most adult men.

OSFM -- Sized to fit the general size range of most women.

OSFM -- Sized for most adult men. Beanies with stretchable fabrics will fit most women as well.