Giro Merino Wool Under Helmet Cycling Cap

The Giro Merino Wool under helmet is lightweight, comfortable and stylish on and off the bike. This cycling cap is thin enough to fit under your helmet and is built with sophisticated panelling to prevent any bunching of fabric.
Compared to many cycling caps the Giro Merino Wool under helmet has a shortened brim giving you better upper peripheral vision without compromising on its ability to block the sun and rain.
Key Features
- Winter weight Australian merino wool blend
- X-Static liner
- Reinforced brim
- Ear flaps fold up or down
- Size: S-M 51-57cm, L-XL 57-63cm
- Colour: Black
Occasionally, without notice, manufacturers change product design and/or specifications.
Use the Giro size chart to find the best fit for you.
Giro Men's Tops Size Chart
Size | Chest | Sleeve |
S (35) | 33 - 35" / 83.8 - 88.9cm | 34" / 86.4cm |
M (38) | 36 - 38" / 91.4 - 96.5cm | 35" / 88.9cm |
L (41) | 39 - 41" / 99.1 - 104.1cm | 36" / 91.4cm |
XL (44) | 42 - 44" / 106.7 - 111.8cm | 36.5" / 92.7cm |
XXL (47) | 45 - 47" / 114.3 - 119.38cm | 37" / 94cm |
Giro Men's Bottoms Size Chart
Size | Waist | Inseam - Pant Only |
28 (XS) | 27.5 - 28.5" / 69.85 - 72.39cm | 31.5" / 80.01cm |
30 (S) | 29.5 - 30.5" / 74.93 - 77.47cm | 31.5" / 80.01cm |
32 (M) | 31.5 - 32.5" / 80.01 - 82.55cm | 32.5" / 82.55cm |
34 (L) | 33.5 - 34.5" / 85.09 - 87.63cm | 33.5" / 85.09cm |
36 (XL) | 35.5 - 36.5" / 90.17 - 92.71cm | 34.5" / 87.63cm |
38 (XXL) | 37.5 - 38.5" / 95.25 - 97.79cm | 34.5" / 87.63cm |
Giro Women's Tops Size Chart
Size | Chest | Sleeve |
XXS (2) | 30 - 31" / 76.2 - 78.7cm | 30.5" / 77.4cm |
XS (4) | 32 - 33" / 81.3 - 83.8cm | 31" / 78.7cm |
S (6) | 34 - 35" / 86.4 - 88.9cm | 31.5" / 80cm |
M (8) | 36 - 37" / 91.4 - 94cm | 32" / 81.3cm |
L (10) | 38 - 39" / 96.5 - 99.1cm | 32.5" / 82.6cm |
XL (12) | 40" / 101.6cm | 33" / 83.8cm |
Giro Women's Bottoms Size Chart
Size | Waist | Hip | Inseam - Pant Only |
2 (XXS) | 23 - 24" / 58.4 - 60.9cm | 33 - 34" / 88.8 - 86.3cm | 30.5" / 77.47cm |
4 (XS) | 25 - 26" / 63.4 - 66cm | 35 - 36" / 88.9 - 91.4cm | 30.5" / 77.47cm |
6 (S) | 27 - 28" / 68.6 - 71.1cm | 37 - 38" / 94 - 96.5cm | 31" / 78.74cm |
8 (M) | 29 - 30" / 73.7 - 76.2cm | 39 - 40" / 99.1 - 101.6cm | 31" / 78.74cm |
10 (L) | 31 - 32" / 78.7 - 81.3cm | 41 - 42" / 104.1 - 106.7cm | 31.5" / 80.01cm |
12 (XL) | 33" / 83.8cm | 43" / 109.2cm | 31.5" / 80.01cm |
Giro Men's Gloves Size Chart
Men | Palm Width | Finger Length |
XS | 7" or less/ 178mm | 6.8" or less/ 174mm or less |
S | 7-6"/ 178-203mm | 6.8-7"/ 175-180mm |
M | 8-9"/ 203-229mm | 7-7.4"/ 181-188mm |
L | 9-9.75"/ 229-248mm | 7.4-7.8"/ 189-199mm |
XL | 9.75-10.5"/ 248-267mm | 7.8-8.3"/ 200-210mm |
XXL | 10.5" or more/ 267mm or more | 8.3" or more/ 211mm or more |
Giro Women's Gloves Size Chart
Women | Palm Width | Finger Length |
S | 6 - 6.7" / 153 - 169mm | 6 - 6.3" / 153 - 160mm |
M | 6.7 - 7.4" / 170 - 189mm | 6.3 - 6.7" / 161 - 169mm |
L | 7.4 - 8.3" / 190 - 210mm | 6.7 - 7" / 170 - 177mm |
Read our clothing size guide for more information on sizing.
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Giro Merino Wool Under Helmet Cycling Cap
Well designed and well made, this Giro cap is very good. It isn't bulky so easily fits under a helmet, and I find that the peak combined with my Oakleys keeps cold headwind off my forehead, adding to the feeling of warmth compared to what I get if just wearing a peak-less skullcap. Plus the pull down flap at teh back covers the ears and back of the neck very well, keeping cold draughts out when worn with a buff. Merino stays warm even when it gets wet, and after a mid-ride cafe stop it doesn't stay cold for very long as a cotton cap would do. Mine is completely black with a small red Giro logo stitched onto the peak. Good price, well worth it. Now my favourite off-season hat.
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