Giro Size Guide
Giro is a leading designer and manufacturer of cycling and snow sports helmets, footwear, and apparel. Known for precision engineering and comfort-focused design, Giro products are engineered to fit a wide range of body types and riding styles. The brand emphasises proper fit for both safety and performance, particularly in helmet sizing where an accurate measurement is critical. Giro's sizing runs true to standard European and North American conventions, with consistent measurements across helmets, shoes, gloves, and clothing.
How to Measure
- Head circumference (for helmets): Wrap a soft measuring tape horizontally around your head, keeping it level from front to back. Position the tape just above your eyebrows and ears. Note the measurement in centimetres.
- Chest (for tops): Wrap the measuring tape around your natural chest, directly under your arms, keeping the tape level and not too tight. Take the measurement in inches or centimetres.
- Waist (for tops and bottoms): Measure around your natural waist, keeping the tape level and relaxed. Do not pull tight.
- Hips (for bottoms): Wrap the measuring tape around the widest part of your hips, keeping it level.
- Foot length (for shoes): Place your foot on a flat surface and measure from the back of your heel to the tip of your longest toe. Wear the socks you intend to ride in for the most accurate measurement.
- Hand length (for gloves): Measure your hand from the base of the thumb to the tip of the middle finger when your hand is flat.
- Hand circumference (for gloves): Wrap the measuring tape around your knuckles, excluding the thumb.
Bike Helmet Size Chart
| Size | Head Circumference (cm) |
|---|---|
| XS (Youth) | 48.5 — 52 |
| S | 52 — 55.5 |
| M | 55.5 — 59 |
| L | 59 — 62.5 |
| XL | 62.5 — 65 |
Snow Helmet Size Chart
| Size | Head Circumference (cm) |
|---|---|
| XS (Youth) | 48.5 — 52 |
| S | 52 — 55.5 |
| M | 55.5 — 59 |
| L | 59 — 62.5 |
| XL | 62.5 — 65 |
Men's Tops Size Chart
| Size | Chest (inches) | Chest (cm) | Waist (inches) | Waist (cm) |
|---|---|---|---|---|
| XS | 33 — 35 | 83.8 — 88.9 | 27 — 29 | 68.6 — 73.7 |
| S | 35 — 37 | 88.9 — 94 | 29 — 31 | 73.7 — 78.7 |
| M | 38 — 40 | 96.5 — 101.6 | 31 — 33 | 78.7 — 83.8 |
| L | 41 — 43 | 104.1 — 109.2 | 33 — 35 | 83.8 — 88.9 |
| XL | 44 — 46 | 111.8 — 116.8 | 35 — 37 | 88.9 — 94 |
| XXL | 47 — 49 | 119.4 — 124.5 | 37 — 39 | 94 — 99.1 |
| XXXL | 50 — 52 | 127 — 132.1 | 39 — 41 | 99.1 — 104.1 |
Women's Tops Size Chart
| Size | Chest (inches) | Chest (cm) | Waist (inches) | Waist (cm) |
|---|---|---|---|---|
| XXS | 30 — 31 | 76.2 — 78.7 | 22 — 24 | 55.9 — 61 |
| XS | 32 — 33 | 81.3 — 83.8 | 24 — 26 | 61 — 66 |
| S | 34 — 35 | 86.4 — 88.9 | 26 — 28 | 66 — 71.1 |
| M | 36 — 37 | 91.4 — 94 | 28 — 30 | 71.1 — 76.2 |
| L | 38 — 39 | 96.5 — 99.1 | 30 — 32 | 76.2 — 81.3 |
| XL | 39 — 41 | 99.1 — 104.1 | 32 — 34 | 81.3 — 86.4 |
| XXL | 41 — 43 | 104.1 — 109.2 | 34 — 36 | 86.4 — 91.4 |
Men's Shoes Size Chart
| EU | UK | US | Foot Length (cm) |
|---|---|---|---|
| 39 | 5.5 | 6.5 | 25 |
| 39.5 | 6 | 7 | 25 |
| 40 | 6.5 | 7.5 | 25.5 |
| 41 | 7 | 8 | 26 |
| 41.5 | 7.5 | 8.5 | 26.5 |
| 42 | 8 | 9 | 27 |
| 43 | 8.5 | 9.5 | 27 |
| 43.5 | 9 | 10 | 28 |
| 44 | 9.5 | 10.5 | 28 |
| 44.5 | 10 | 11 | 28.5 |
| 45 | 10 | 11 | 29 |
| 45.5 | 10.5 | 11.5 | 29 |
| 46 | 11 | 12 | 29.5 |
| 46.5 | 11.5 | 12.5 | 30 |
| 47 | 12 | 13 | 30 |
| 48 | 12.5 | 13.5 | 31 |
| 49 | 13 | 14 | 31.5 |
| 50 | 14 | 15 | 32 |
Women's Shoes Size Chart
| EU | UK | US | Foot Length (cm) |
|---|---|---|---|
| 36 | 3 | 5 | 22 |
| 37 | 4 | 6 | 22.75 |
| 38 | 5 | 6.5 | 23.5 |
| 39 | 5.5 | 7.5 | 25 |
| 40 | 6.5 | 8.5 | 25.5 |
| 41 | 7 | 9 | 26 |
| 42 | 8 | 10 | 27 |
| 43 | 8.5 | 10.5 | 27.5 |
Unisex Shoes Size Chart
| EU | UK | US | Foot Length (cm) |
|---|---|---|---|
| 36 | 3 | 4 | 22 |
| 37 | 4 | 5 | 22.75 |
| 38 | 5 | 6 | 23.5 |
| 39 | 5.5 | 6.5 | 25 |
| 39.5 | 6 | 7 | 25 |
| 40 | 6.5 | 7.5 | 25.5 |
| 41 | 7 | 8 | 26 |
| 41.5 | 7.5 | 8.5 | 26.5 |
| 42 | 8 | 9 | 27 |
| 43 | 8.5 | 9.5 | 27 |
| 43.5 | 9 | 10 | 28 |
| 44 | 9.5 | 10.5 | 28 |
| 44.5 | 10 | 11 | 28.5 |
| 45 | 10.5 | 11 | 29 |
| 45.5 | 11 | 11.5 | 29 |
| 46 | 11.5 | 12 | 29.5 |
| 46.5 | 12 | 12.5 | 30 |
| 47 | 12.5 | 13 | 30 |
| 48 | 13 | 13.5 | 31 |
| 49 | 14 | 14 | 31.5 |
| 50 | 14 | 15 | 32 |
Men's Gloves Size Chart
| Size | Hand Length (cm) | Hand Circumference (cm) |
|---|---|---|
| XS | 17 — 17.4 | 17.3 — 17.8 |
| S | 17.5 — 18 | 17.8 — 20.3 |
| M | 18.1 — 18.8 | 20.3 — 22.9 |
| L | 18.9 — 19.9 | 22.9 — 24.8 |
| XL | 20 — 21 | 24.8 — 26.7 |
| XXL | 21.1 — 21.5 | 26.7 — 27.6 |
Women's Gloves Size Chart
| Size | Hand Length (cm) | Hand Circumference (cm) |
|---|---|---|
| S | 15.3 — 16 | 16.5 — 18.4 |
| M | 16.1 — 16.9 | 18.4 — 20.3 |
| L | 17 — 17.7 | 20.3 — 22.2 |
Unisex Socks Size Chart
| Size | EU Shoe Size Range |
|---|---|
| S | EU 36 — 39 |
| M | EU 40 — 42 |
| L | EU 43 — 45 |
| XL | EU 46 — 48 |
Product-Specific Guidance
Bike Helmets
Giro helmets are engineered for safety and comfort. Head circumference is the critical measurement. When properly fitted, your helmet should sit level on your head, covering your forehead without obstructing your vision. The fit system should have room to adjust when loose. Many Giro helmets feature MIPS (Multi-directional Impact Protection System) technology, which provides additional protection against rotational forces during impacts. Always try your helmet on before purchase to ensure it sits securely and comfortably.
Cycling and Snow Sports Shoes
Giro offers both men's, women's, and unisex shoe ranges across cycling and outdoor snow sports categories. Foot length is the most reliable measurement for shoe sizing. Measure your foot while wearing the socks you plan to wear with your shoes. Giro shoes typically run true to size, but some models may have a slightly narrower or wider toebox depending on the collection. Consider the ventilation and insulation features when choosing between models, particularly for snow applications.
Cycling and Winter Gloves
Glove fit is essential for dexterity and control. Both hand length and hand circumference determine your correct size. Giro offers gendered glove designs, with women's gloves cut narrower across the palm. Ensure your gloves allow full finger and thumb mobility without excess fabric bunching. When trying on gloves, check that the cuff sits comfortably above your wrist without gaps.
Apparel (Jerseys, Jackets, and Bottoms)
Giro's clothing lines feature performance-oriented fits suitable for cycling and outdoor sports. Men's and women's cuts differ significantly, so always refer to the correct size chart for your gender. Allow for variance based on your preferred fit — some riders prefer a snug performance fit, whilst others prefer a more relaxed cut. Chest and waist measurements are the primary indicators; if your measurements fall between sizes, order the larger size unless you prefer a tight fit.
Sizing Tips
- Try before riding: Giro recommends trying on helmets, shoes, and apparel before committing to extended use, as comfort and fit directly affect performance and safety.
- Measure twice, order once: Have someone assist with measurements for greater accuracy, particularly for head circumference and foot length. Measure in the morning when feet are smallest.
- Account for socks and insoles: When measuring feet for shoes, wear the socks and any custom insoles you plan to use during rides. This ensures accurate sizing.
- Helmet fit matters: A properly fitted Giro helmet should sit level on your head with roughly a finger's width of space between the helmet rim and your eyebrows. Adjust the fit system to secure it once you have the correct size.
- Check toebox shape: Giro shoes span multiple widths and toebox shapes across models. If you have wide feet, confirm that the specific model you're ordering can accommodate your foot shape, not just length.
- Women's and men's cuts differ: Women's clothing, gloves, and shoes are cut with narrower shoulders, smaller hands, and different waist-to-hip ratios. Never assume men's and women's sizes are equivalent in EU or US numbers.
- Sizing allowance for layering: If purchasing winter or snow apparel, consider the base layers and mid-layers you plan to wear underneath. Giro's size ranges are designed to accommodate typical layering, but very thick insulation may require upsizing.
- Return generously within 100 days: Many retailers stocking Giro (including Giro's official partners) allow returns within 100 days. If your first choice doesn't fit perfectly, use this window to swap sizes without penalty.