Removable Neck Skirt: Zip off neck skirt keeps you warmer when the air gets cold and has built-in pockets for your MP3 player speakers and wire.
Liner: Technical fabric liner wicks moisture to keep you comfortable, is fully removable, washable, and treated to be odor and bacteria resistant.
Head Shape: Long oval.
DOT certified.
For proper fit and size measure the circumference of your head 1" above your eyebrows and around the largest portion of the back of your head.
20.8" - 21.3" ---------- X-Small
21.6" - 22.0" ---------- Small
22.4" - 22.8" ---------- Medium
23.2" - 23.6" ---------- Large
24.0" - 24.4" ---------- X-Large
24.8" - 25.2" ---------- XX-Large
25.6" - 26.0" ---------- XXX-Large
26.3" - 26.7" ---------- XXXX-Large