Advice & Guides Advice: How to make sure your helmet fits correctly
You'd be surprised how many riders wear a helmet that's too big for them. Here's how to tell if a lid really fits you...
1 Feb 2022
John Doe JD/One - Signature Black / Grey
Retro 70s design, full face helmet with multipart EPS system and extra large field of view
Details
RRP
£299.00
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Quick find: 2479602
Verified Customer Reviews for John Doe JD/One
Great fit, quality first class
06 July 2025 by Tom C
Like everything about it. Price exceptional for the quality of the product
Style: Gloss Black
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Top Helmet!
23 June 2025 by Vin
I recently picked up the John Doe JD/One in the Frozen Titanium finish, and I’m genuinely impressed. The build quality is outstanding — it feels solid yet lightweight, with excellent attention to detail. The Frozen Titanium colourway looks even better in person: sleek, subtle, and aggressive without being flashy.
The fit is snug but comfortable, and the lining feels premium. Ventilation is well thought out, keeping things cool even on warmer days. Visibility is excellent, and the visor mechanism is smooth and easy to operate, even with gloves on.
I also appreciate the quieter ride — noise levels are impressively low, especially compared to other helmets in this price range. Overall, it’s clear that John Doe has poured real thought into both design and function here.
Would highly recommend this to anyone looking for a high-performance, stylish helmet that doesn’t compromise on comfort or safety. Great service and fast delivery from Sportsbikeshop as always!
Style: Frozen Titanium
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John Doe 1 helmet
22 June 2025 by Ian M
This helmet oozes quality from the looks to the packaging. Product out of stock everywhere with long lead times Sportbike shop were the only stockist to have one in that was the required size. Helmet was delivered quickly (as always by Sportsbikeshop) and after the first ride out I can confirm it is as good as it looks. Excellent wide field of view, best I have experienced in any helmet owned and I have now also bought a dark visor for it which I think suits it better than the coloured one it comes with. The only improvement I could suggest would be to include a drop down internal black sun visor like some of my other helmets have
Style: Frozen Titanium
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Stylish and comfortable.
12 June 2025 by Anonymous
Great quality feel for the price.
Style: Frozen Titanium
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Beautiful quality
01 June 2025 by Jason
Looks matter. Comfort matters. Both are excellent.
Style: Gloss Black
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Description
JD/One helmet
Two visors - clear and tinted
Visor cover
Product Specification
Variants
Spares & Accessories
Lining & Cheek Pads
Manufacturer
John Doe JD/One - Signature Black / Grey
- Shell in plastic-reinforced fibreglass (FRP) and carbon composite
- Multipart EPS system with varying shock absorption rates
- Extra large field of view
- Ventilation system at the front and back, adjustable to multiple levels
- JD/One antifog, anti-scratch, and UV blocking visor (clear and tinted versions)
- Prefitted for comms systems/speakers
- Replaceable and washable inner lining and cheek pads
- Emergency quick-release system (EQRS)
- Suitable for glasses wearers
- Inner padding in quick-dry antibacterial fabric
- Outer shells in 4 sizes (XS-S/M/L/XL)
- Double D-ring fastening system
- Weight 1450g +/- 50g
- Certified ECE 22.06
The JD/One Helmet gives you no end of possibilities for customisation to match your look. The helmet comes in a retro 70s design without compromising on safety and comfort. Whether you're into riding along the highways, planning an off-road adventure, or aiming for that old-school look, this helmet goes with every motorbiking style.
John Doe's multi-lock system makes it easy to attach accessories such as a visor, sun peak , or blanking panel. This lets you customise your helmet exactly the way you want it. Discover a world of accessories for JD/One helmets.
The JD/One is certified according to ECE 22.06 and DOT FMVSS No. 218 test procedures. John Doe have been able to design an extremely compact helmet shell in advanced composite fibreglass that's strong enough to satisfy this rigorous level of testing. The JD/One helmet benefits from state-of-the-art manufacturing processes and technologies coupled with timeless design.
John Doe have developed a separate helmet shell for each helmet size to ensure maximum comfort; only sizes XS and S share the same outer shell. This will make it easier for you to find the helmet size that fits your head and your style. The internal vent system is adjustable to multiple levels at the front and back of the helmet; it cools the air around your head as you rider, safely routing moisture and heat out of the helmet.
As you'd expect, your JD/One helmet comes with antifog, scratch resistant visor coating, emergency quick-release system (EQRS), double D-ring fastening, and replaceable and adjustable inner lining as standard.
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