The Quadrant Helmet offers outstanding value with uncompromising quality and exceeds both DOT and SNELL standards. From the plush interior to the molded roost guard and dual-density styrene liner, the Quadrant sets the standard for other helmets to follow.

Size	Inch Around	Hat Size	cm
XX-Small	20-1/2	6-1/2	51-52
X-Small	20-3/4 - 21-1/4	6-5/8 - 6-3/4	53-54
Small	21-5/8 - 22	6-7/8 - 7	55-56
Medium	22-3/8 - 22-3/4	7-1/8 - 7-1/4	57-58
Large	23-1/4 - 23-5/8	7-3/8 - 7-1/2	59-60
X-Large	24 - 24-1/2	7-5/8 - 7-3/4	61-62
XX-Large	24-3/4 - 25-1/4	7-7/8 - 8-1/8	63-64