"Lock 'N Load™" rapid conversion shield replacement system.
"All Clear!™ Sight System" optically correct, anti-scratch, and UV resistant faceshield.
Double D-Ring retention system.
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