LTB Motorsports

The M4 is an aggressively styled, multi-featured, full-ventilation helmet with an extra large eyeport. Styled after the M4 Pro, the M4 can be used in all forms of racing. SA2005

 

Sizing Chart:
Size	Hat	Inches
XX-small	6 3/4	22 1/4
XX-small	6 7/8	21 5/8
x-small	7	22
Small	7 1/8	22 3/8
Medium	7 1/4	22 3/4
Medium	7 3/8	23 1/8
Large	7 1/2	23 1/2
Large	7 5/8	23 7/8
X-Large	7 3/4	24 1/4
XX-Large	8	25 1/8
XX-Large	8	25 1/2
XX-Large	8 1/4	25 7/8
XX-Large	8 1/4	26 1/4
XX-Large	8 1/2	26 3/8

An effective helmet is one that fits properly. Have an assistant use a measuring tape, or a piece of string to measure the circumference of your head starting at a point approximately one inch above the eyebrows in front, around a point in the back of the head that results in the largest possible measurement, and finally wrapping back to the front. It is a good idea to take several measurements to make sure you have the largest one.