These are well built hats, but smaller than I expected. I normally wear a size 7.5 hat (large, but not extra large) and this hat fits snug on me, even with the elastic stretched out. I also own a Columbia Bora Booney hat which fits me fine. I don't know if the Carl Peak hat is snugger because of the design or because it uses a stiffer fabric.
<a data-hook="product-link-linked" class="a-link-normal" href="/Columbia-Bora-Bora-Booney-II-Sun-Hats-Fossil-One-Size/dp/B0058YU2DS/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Columbia Bora Bora Booney II Sun Hats, Fossil, One Size</a>