The Quadrant offers great performance and excellent comfort in a lightweight design. Built to exceed both DOT and ECE 22.05 standards, the Quadrant is truly a world-class helmet loaded with features normally found on more expensive helmets. Featuring a dual-density expanded polystyrene liner, extensive venting, molded roost guard and a plush removable liner, the Quadrant offers comfort and performance in a lightweight package that’s got great balance and a secure fit. Our new Rockstar helmet is emblazoned with the official Rockstar logos and colors that’ll get you noticed on any track. The Quadrant Rockstar helmet features a unique print that’s as aggressive as the brand it represents.

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