The GLX 335 Whisper graphic was inspired at the facility in CA. The growth of women in the motorcycle industry has made this helmet one of the most popular models for women. The shell is composed of lightweight ABS thermoplastic resign making it very strong and durable. The interior of the helmet is made polyester which is very soft and comfortable and well as removable and or replaceable. 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 3/8" - 22 3/4" =  Medium; 23 1/4" - 23 5/8" = Large; 24" - 24 3/8" = X-Large; 24 3/4" - 25 1/4" = XX-Large. DOT Certified.