Video Disclaimer: Definitely not a helmet :) The Foam Dome is a solid part of the KAVU headwear line up. This 5-panel trucker has the same foam front crown as seasons past, however this year there an important upgrade straight from the Unicorn Farm. The back mesh is now the softest, pliable-est, comfiest back mesh that's ever touched your noggin. 5 panel trucker with foam front and bill, embroidered patch on front, bill shipped flat but can adjust, soft pliable mesh back with adjustable snap closure, interior taping and moisture absorbing sweatband. Size: OSFM (one size fits most) ALPHA Easy fit / FITTED hat size: M/L, 7 1/8 -7 5/8 Head Circumference: 22"-24.5" Fit Profile (crown): Mid Profile, 6.75" Bill Length: 2.75" Fabric: 100% polyester