Name: Alpinestars SM3 Radium Helmet
Brand: Cycle Gear
SKU: alpinestars-1771
Availability: InStock

Alpinestars SM3 Radium Helmet

Size chart

Clothing Size Conversion Chart
Category	US	EU	UK	Chest (in)	Waist (in)	Hips (in)
Men	XS	44	34	32-34	26-28	33-35
	S	46	36	34-36	28-30	35-37
	M	48	38	38-40	32-34	39-41
	L	50	40	42-44	36-38	43-45
	XL	52	42	46-48	40-42	47-49
Women	XS	32	6	31-32	24-25	33-34
	S	34	8	33-34	26-27	35-36
	M	36	10	35-36	28-29	37-38
	L	38-40	12-14	37-39	30-32	39-41
	XL	42	16	40-42	33-35	42-44
Youth	XS	128	7	26-28	23-24	26-28
	S	134	8	28-30	24-25	28-30
	M	140	10	30-32	25-26	30-32
	L	146	12	32-34	26-27	32-34
	XL	152	14	34-36	27-28	34-36

Pants Size Conversion Chart
Category	US	EU	UK	Waist (in)	Hip (in)	Inseam (in)
Men	28	44	28	28	34	30
	30	46	30	30	36	31
	32	48	32	32	38	32
	34	50	34	34	40	33
	36	52	36	36	42	34
Women	0	32	4	24	34	30
	2	34	6	25	35	30
	4	36	8	26	36	31
	6	38	10	27	38	32
	8	40	12	28	40	32

Shoes Size Conversion Chart
Category	US	EU	UK	Foot Length (in)
Men	6	39	5.5	9.25
	7	40	6.5	9.625
	8	41	7.5	10
	9	42	8.5	10.25
	10	43	9.5	10.625
	11	44	10.5	11
	12	45	11.5	11.25
	13	46	12.5	11.625
Women	5	35	2.5	8.5
	6	36	3.5	8.875
	7	37	4.5	9.25
	8	38	5.5	9.625
	9	39	6.5	10
	10	40	7.5	10.25
	11	41	8.5	10.625
	12	42	9.5	11
M (Unisex)	5	37	4.5	8.75
	6	38	5.5	9
	7	39	6.5	9.5
	8	40	7.5	10
	9	41	8.5	10.25
	10	42	9.5	10.625
	11	43	10.5	11
	12	44	11.5	11.25

color

Black/Red/White

Black/White/Grey

Grey/Black/Yellow

Red/White

Size

Clear

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Alpinestars SM3 Radium Helmet For off-road riding, the Supertech M3 Helmet stands as a value-driven choice well-suited for MX, enduro, and various recreational terrains. This helmet is designed to excel under challenging conditions, featuring both DOT and ECE certifications that ensure safety and performance. The product is enhanced with Alpinestars’ Rotational Acceleration Force Protection technology, offering crucial protection to riders by mitigating brain injuries from oblique impacts. The SM3 is constructed with four densities of EPS, integrated across five different EPS sizes, enabling a finer-tuned fit for a wide range of head shapes. Construction: A race-inspired helmet with solid aerodynamics and design borrowed from SM5 and SM10 helmets Thermo-injected shell incorporating a special polymer blend Rotational Acceleration Force Protection Visor Release Patented visor release system ensures the visor is released with the correct predetermined amount of force Effectively reduces the forces on the rider’s neck during an impact 5 EPS inner liner sizes 4 densities of EPS effectively manage volume and impact performance Hydration tube channels are integrated into the helmet’s cheek pads for convenience and performance Comfort: Fit can be tailored to the rider’s head replacement liner and cheek pads with different thicknesses (sold separately) Maximized ventilation and high levels of heat transfer exchange 10 inlets and 7 exhaust ports 25mm soft textile chin strap Safety: Rotational Acceleration Force Protection Alpinestars patented low-friction coating is applied to the inner part of the main EPS liner to reduce the rotational acceleration forces Acts as a slip plane to mimic the brain’s own low-friction cerebrospinal fluid Reduces forces of oblique impacts Equipped with an Emergency Release Cheek Pad System Permits the safe and easy removal of the cheek pads while the helmet is still on Stainless steel D-rings Emergency Release System and removable cheek pads DOT and ECE 22.06 certified

color

Size

2XL