Use a size chart to choose where to start, then test the fit of the exact helmet. A useful fitting ends with a recorded model, size and configuration that stays secure and does not create painful pressure.
1. Prepare for the fitting
Bring your normal glasses, a flexible measuring tape if you have one, and a short list of helmets available in your market. Leave time to compare candidates without rushing an order. Our women’s helmet fit guide covers small sizes, hair and model-specific fitting examples. Ask about the shop’s fitting service and return conditions before purchasing.
Measure around the head just above the eyebrows and around the fullest part at the back, as described by NHTSA. Repeat the measurement and use the chart for the particular model. Our measurement guide covers this first step. NHTSA sizing guidance.
2. Put it on and adjust the strap
Seat the helmet fully and fasten it according to its manual. SHARP recommends adjusting the strap so it is secure while allowing you to open and close your mouth. Take time with a quick-release buckle: closing it does not replace the initial length adjustment. SHARP fitting sequence.
A modular helmet also needs its model-specific chin-bar checks. Ask the retailer to demonstrate the complete sequence, rather than judging the fit only with the front raised.
3. Check movement and retention
With the strap secured, follow SHARP’s side-to-side and forward/backward checks. In a full-face helmet, the cheeks should move with the helmet and remain in contact with the pads; the helmet should not slip around the head. SHARP also describes an assisted roll-off check, carefully pushing from the rear base with the head tilted forward. Have a trained retailer help with this check. Read the movement and retention instructions.
4. Give pressure points time to appear
NHTSA suggests wearing a new helmet for 30–45 minutes before riding to reveal delayed pressure points. Evaluate it indoors under the seller’s return conditions. The desired sensation is even snugness, rather than concentrated pain. Shape matters as well as circumference, so a different model may be more suitable than a larger size. NHTSA advice on shape and pressure points.
5. Check your everyday equipment
- Put on your usual glasses and check for uncomfortable pressure from the arms.
- While stationary, close the visor and try the sun visor if fitted; check for contact with your glasses.
- Try the controls with your riding gloves and ask about anything you cannot operate confidently.
- Record any change in comfort after fitting an approved accessory, then repeat the checks.
Treat these as practical shopping checks alongside the manufacturer’s fitting instructions.
If the fit is not right
| What you notice | Next step |
|---|---|
| Between two chart sizes | Try both with a fitter; do not choose solely from the size letter. |
| A pressure point appears | Reassess size and shape; do not plan to tolerate pain. |
| Helmet slips in the checks | Recheck the adjustment with the fitter and try another candidate if needed. |
| Padding adjustment is proposed | Confirm the exact approved parts and repeat the full fitting. |
NHTSA recognizes manufacturer-provided replacement pads and liners as fitting options and cautions against other interior alterations. Do not cut or compress the impact liner to make room. Permitted adjustment guidance.
Keep a fitting record
Write down the brand, model, market, size, padding configuration and any accessory fitted. Add the retailer’s part numbers and keep the receipt and manual. This gives you a useful reference when ordering replacements or asking for help later.
For a practical shortlist, use the C5 vs Neotec 3 comparison. For the role of head shape, continue with our head-shape guide.
