Helios Spherical Helmet

Black/Black / S

$449.99

Helios Spherical Helmet

$449.99

Taxes included.

ColorBlack/Black

Size S M L

Giro design, and high-performance innovation for core road cyclists, gravel enthusiasts, and adventure riders.

The heart of the Helios's extraordinary design and performance is Spherical Technology, which utilizes a ball-and-socket design powered by Mips®, the market-leading brain protection system that can help to reduce rotational forces. Spherical Technology allows the helmet's outer liner to rotate around the inner liner during a crash, and also allows Progressive Layering of the inner and outer liners to provide more comprehensive protection and performance. In addition to advanced head protection, the Helios's 15 Wind Tunnel vents provide exceptional cooling power that's enhanced by our patented Roc Loc 5 Air fit system and plush, antimicrobial XT2 padding for exceptional sweat absorption. It's the ideal match for your road and gravel adventures.

Spherical Technology — Ball-and-socket design powered by Mips® allows the outer liner to rotate around the inner liner during impact, helping redirect forces away from the brain and eliminating contact with hard slip-planes against the skin.
Progressive Layering™ — Dual-density EPS foam liners manage both high- and low-speed impacts for advanced energy absorption and comprehensive protection.
Mips® Brain Protection System — Engineered to reduce rotational forces during certain impacts, enhancing rider safety while meeting and exceeding stringent standards.
Wind Tunnel Internal Channeling — Internal airflow system works with large vents to drive cool air over the scalp and expel heat, delivering powerful cooling performance.
Roc Loc® 5 Air Fit System — Suspends the helmet slightly off the skull to boost airflow and cooling. Offers one-handed fit tension and tilt adjustment for superior comfort and stability.
Ionic+® Padding — Infused with pure silver for natural, permanent odor protection to keep the helmet feeling fresh ride after ride.

Size Chart

These size charts and conversions are meant to serve as a guide. We recommend you try-on before riding to ensure full comfort and performance.

BIKE HELMET SIZE GUIDE

HOW TO MEASURE YOUR SIZE

Wrap a measuring tape around your head, keeping the tape level from front to back. Note the measurement and reference the Size Guide.

Note: Make sure the helmet fits with a little room when the fit system is loose, and sits low enough to protect your forehead without hindering your vision. Once you’ve got the right size, you can adjust the fit.

ADULT SUPER FIT SIZE	CIRCUMFERENCE
S	51 - 55 cm
M	55 - 59 cm
L	59 - 63 cm
XL	63 - 65 cm

YOUTH SIZE	CIRCUMFERENCE
XS (Scamp Model)	45 - 49 cm
S (Scamp Model)	49 - 53 cm
XS (Dime Model)	47 - 51 cm
S (Dime Model)	51 - 55 cm
Universal Child	47 - 54 cm
Universal Youth (Ages 5+)	50 - 57 cm

ADULT SUPER FIT FULL FACE	CIRCUMFERENCE
S	51 - 53 cm
M	51 - 55 cm
L	55 - 59 cm
XL	59 - 63 cm

ADULT UNIVERSAL	CIRCUMFERENCE
Women Adult	50 - 57 cm
Unisex	54 - 61 cm
Extra Large	58 - 65 cm

GLOVES SIZE GUIDE

MEASURING YOUR HAND FOR THE BEST FIT

You can measure the length and width of your hand as illustrated above, and use the Size Guide to determine your size.1. Wrap the tape measure around your hand at the widest part of the palm, and lightly close your hand to get your Hand Width measurement.2. Once you have that measurement recorded, use a tape measure to determine the length of your hand from the tip of your longest finger to the base of your palm at the wrist. This is your Hand Length measurement.3. You can then compare the measurements of your hand with the data supplied in the Size Guide to determine the best fitting size for you..

MEN'S SIZE	HAND WIDTH	HAND LENGTH
XS (6)	6.3 - 7” / 160 - 178 mm	5.9 - 6.5” / 150 - 164 mm
S (7)	7” / 179 - 200 mm	6.5 - 7” / 165 - 179 mm
M (8)	8 - 8.6” / 201 - 219 mm	7 - 7.6” / 180 - 194 mm
L (9)	8.7 - 9” / 220 - 234 mm	7.7 - 8” / 195 - 204 mm
XL (10)	9.25 - 9.8” / 235 - 249 mm	8 - 8.6” / 205 - 219 mm
XXL (11)	9.85 - 10” / 250 - 265 mm	8.7 - 9.25” / 220 - 235 mm
XXXL (12)	10.4 - 10.6” / 265 - 270 mm	9.25 - 9.6” / 235 - 245 mm

WOMEN'S SIZE	HAND WIDTH	HAND LENGTH
S (6)	6 - 6.7” / 155 - 169 mm	6.3 - 6.7” / 160 - 169 mm
M (7)	6.7 - 7.4” / 170 - 189 mm	6.7 - 7.2” / 170 - 183 mm
L (8)	7.4 - 8” / 190 - 204 mm	7.3 - 7.7” / 185 - 195 mm
XL (9)	8 - 8.3” / 205 - 210 mm	7.7 - 8” / 196 - 205 mm

YOUTH SIZE	HAND WIDTH	HAND LENGTH
XS (3)	5.2 - 5.6” / 133 - 142 mm	5.9 - 6” / 150 - 154 mm
S (4)	5.6 - 5.9” / 143 - 152 mm	6 - 6.3” / 155 - 159 mm
M (5)	6 - 6.4” / 153 - 162 mm	6.3 - 6.5” / 160 - 165 mm
L (6)	6.4 - 6.8” / 163 - 172 mm	6.5 - 6.7” / 165 - 169 mm

SOCK SIZE GUIDE

SOCK SIZE	EU SHOE	MENS US SHOE
S	36 - 39	4 - 6.5
M	40 - 42	7.5 - 9
L	43 - 45	9.5 - 11
XL	46 - 48	12 - 13.5

FOOTWEAR SIZE CONVERSIONS

EU SIZE	US MENS	US WOMENS
36	-	5
37	-	6
37.5	-	6.5
38	-	6.5
38.5	-	7
39	6.5	7.5
39.5	7	8
40	7.5	8.5
40.5	7.5	8.5
41	8	9
41.5	8.5	9.5
42	9.5	10.5
42.5	9.5	10.5
43	9.5	10.5
43.5	10	-
44	10.5	-
44.5	11	-
46	12	-
46.5	12.5	-
47	13	-
48	13.5	-
49	14	-
50	15	-