"Lock 'N Load™" rapid conversion shield replacement system.
"All Clear!™ Sight System" optically correct, anti-scratch, and UV resistant faceshield.
Quick release chin strap.
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 7/8" – 21 1/4" -----X-Small
21 5/8" - 22" --------Small
22 1/2" - 22 7/8" ----Medium
23 1/4" - 23 5/8" ----Large
24" - 24 3/8" --------X-Large
24 3/4" - 25 1/4" ----XX-Large