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The Ratio™ helmet has the perfect ratio of everything you need to accompany you on the mountain, from its thermostat control adjustable venting to its laid-back style. The Ratio™ is a no-nonsense helmet that boasts the features found on premium helmets at a more accessible price. Beneath the sleek silhouette, you'll find the adjustability of an In Form fit system, Thermostat Control adjustable venting and compatibility with aftermarket audio systems by Outdoor Tech.
Our Stack Vent was developed based on research showing the majority of warm air that can cause fogging comes from the goggle's center top vent. Aligning the Stack Vent in the helmet with the center vent of the goggle helps keep it clear and fog-free.
THERMOSTAT CONTROLThermostat Control Adjustable Venting allows you to custom-tune airflow instantly with a simple, low profile control button on the outside of the helmet. No other system is faster or easier to adjust, and nothing is more effective at keeping you comfortable.
VERTICAL TUNINGAccommodates different goggles and head shapes for a custom fit free of gaper gap
HARD SHELL CONSTRUCTIONHard Shell Construction produces great helmets at a great price. A rugged outer shell is molded and then attached to the EPS foam liner.
SEAMLESS COMPATIBILITYFor optimal performance of both helmets and goggles, Giro products are designed to work together, ensuring a seamless interface between helmet and goggle for an exceptional fit and dependable, worry-free function.
|
SHELL TYPE |
HARD SHELL CONSTRUCTION PRODUCES GREAT HELMETS AT A GREAT VALUE. A RUGGED OUTER SHELL IS MOLDED AND THEN ATTACHED TO THE EPS FOAM LINER. |
|
SPORT |
SNOW |
|
VENTILATION TYPE |
THERMOSTAT CONTROL™ ADJUSTABLE VENTING ALLOWS YOU TO CUSTOM-TUNE AIRFLOW INSTANTLY WITH A SIMPLE, LOW-PROFILE CONTROL BUTTON ON THE OUTSIDE OF THE HELMET STACK VENT™ TECHNOLOGY |
|
GENDER |
UNISEX |
|
FIT SYSTEM |
THE IN FORM™ FIT SYSTEM MAKES IT EASY TO DIAL IN A CUSTOM FIT IN SECONDS - EVEN WITH GLOVES ON. AN ERGO-FRIENDLY DIAL AT THE BASE OF THE HELMET PROVIDES UP TO 6CM OF ADJUSTMENT AND ENHANCED STABILITY. VERTICAL TUNING |
|
ELECTRONICS COMPATIBILITY |
COMPATIBLE WITH AFTERMARKET GIRO AUDIO SYSTEMS BY OUTDOOR TECH |
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|
ADULT SUPER FIT BIKE HELMET SIZE |
CIRCUMFERENCE |
|
S |
51 - 55 cm |
|
M |
55 - 59 cm |
|
L |
59 - 63 cm |
|
XL |
63 - 65 cm |
|
YOUTH BIKE HELMET 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 BIKE HELMET |
CIRCUMFERENCE |
|
S |
51 - 53 cm |
|
M |
51 - 55 cm |
|
L |
55 - 59 cm |
|
XL |
59 - 63 cm |
|
ADULT UNIVERSAL BIKE HELMET |
CIRCUMFERENCE |
|
Women Adult |
50 - 57 cm |
|
Unisex |
54 - 61 cm |
|
Extra Large |
58 - 65 cm |
SNOW HELMET SIZE GUIDE
|
ADULT SNOW HELMET SIZE |
CIRCUMFERENCE |
|
S |
52 - 55.5 cm |
|
M |
55.5 - 59 cm |
|
L |
59 - 62.5 cm |
|
XL |
62.5 - 65 cm |
|
YOUTH SNOW HELMET SIZE |
CIRCUMFERENCE |
|
XS |
48.5 - 52 cm |
|
S |
52 - 55.5 cm |
|
M |
55.5 - 59 cm |
MEN’S TOPS SIZE GUIDE
|
SIZE |
CHEST |
WAIST |
|
XS |
33 - 35” / 83.8 - 88.9 cm |
27 - 29” / 68.6 - 73.7 cm |
|
S |
35 - 37” / 88.9 - 94 cm |
29 - 31” / 73.7 - 78.7 cm |
|
M |
38 - 40” / 96.5 - 101.6 cm |
31 - 33” / 78.7 - 83.8 cm |
|
L |
41 - 43” / 104.1 - 109.2 cm |
33 - 35” / 83.8 - 88.9 cm |
|
XL |
44 - 46” / 111.8 - 116.8 cm |
35 - 37” / 88.9 - 94 cm |
|
XXL |
47 - 49” / 119.4 - 124.5 cm |
37 - 39” / 94 - 99.1 cm |
|
XXXL |
50 - 52” / 127 - 132.1 cm |
39 - 41” / 99.1 - 104.1 cm |
WOMEN’S TOPS SIZE GUIDE
|
SIZE |
CHEST |
WAIST |
|
XXS |
30 - 31” / 76.2 - 78.7 cm |
22 - 24” / 55.9 - 61 cm |
|
XS |
32 - 33” / 81.3 - 83. cm |
24 - 26” / 61 - 66 cm |
|
S |
34 - 35” / 86.4 - 88.9 cm |
26 - 28” / 66 - 71.1 cm |
|
M |
36 - 37” / 91.4 - 94 cm |
28 - 30” / 71.1 - 76.2 cm |
|
L |
38 - 39” / 96.5 - 99.1 cm |
30 - 32” / 76.2 - 81.3 cm |
|
XL |
39 - 41” / 99.1 - 104.1 cm |
32 - 34” / 81.3 - 86.4 cm |
|
XXL |
41 - 43” / 104.1 - 109.2 cm |
34 - 36” / 86.4 - 91. 4cm |
MEN’S BOTTOMS SIZE GUIDE
|
SIZE |
HIP |
WAIST |
|
28 (XS) |
33 - 35” / 83.8 - 88.9 cm |
27 - 29” / 68.6 - 73.7 cm |
|
30 (S) |
35 - 37” / 88.9 - 94 cm |
29 - 31” / 73.7 - 78.7 cm |
|
32 (M) |
38 - 40” / 96.5 - 101.6 cm |
31 - 33” / 78.7 - 83.8 cm |
|
34 (L) |
40 - 42” / 101.6 - 106.7 cm |
33 - 35” / 83.8 - 88.9 cm |
|
36 (XL) |
42 - 44” / 106.7 - 111.8 cm |
35 - 37” / 88.9 - 94 cm |
|
38 (XXL) |
44 - 46” / 111.8 - 116.8 cm |
37 - 39” / 94 - 99.1 cm |
|
40 (XXXL) |
46 - 48” / 116.8 - 121.9 cm |
39 - 41” / 99.1 - 104.1 cm |
WOMEN’S BOTTOMS SIZE GUIDE
|
SIZE |
HIP |
WAIST |
|
XS |
32 - 34” / 81.3 - 86.4 cm |
22 - 24” / 55.9 - 61 cm |
|
S |
34 - 36” / 86.4 - 91.4 cm |
24 - 26” / 61 - 66 cm |
|
M |
36 - 38” / 91.4 - 96.5 cm |
26 - 28” / 66 - 71.1 cm |
|
L |
38 - 40” / 96.5 - 101.6 cm |
28 - 30” / 71.1 - 76.2 cm |
|
XL |
40 - 42” / 101.6 - 106.7 cm |
30 - 32” / 76.2 - 81.3 cm |
|
XXL |
42 - 44” / 106.7 - 111.8 cm |
32 - 34” / 81.3 - 86.4 cm |
|
XXXL |
44 - 46” / 111.8 - 116.8 cm |
34 - 36” / 86.4 - 91.4 cm |
|
MEN'S GLOVE 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 - 21 9mm |
|
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 GLOVE 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 - 18 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 GLOVE 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 |
- |
