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Stilo ST6 KRT Composite Kart Helmet

From £502.00

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The Stilo ST6 KRT Composite Kart Helmet is purpose-built for adult karting, combining strong protection with a lightweight design to support comfort and performance on track. Its composite shell construction is engineered to deliver dependable impact protection while keeping overall weight under control, helping to minimise fatigue and maintain stability during longer driving sessions.

Designed to meet the latest FIA 8878-2024 and Snell K2025 karting helmet standards, the ST6 KRT Composite incorporates several refinements that enhance visibility, airflow, and overall fit. Updates to the visor system, ventilation layout, and interior padding provide practical improvements that help drivers stay focused and comfortable in demanding racing conditions.

Engineered for the demands of competitive karting, the ST6 KRT Composite focuses on key performance factors such as weight balance, visibility, and ventilation. The lightweight composite shell helps reduce physical strain over extended stints, while the improved eye port enhances track awareness when approaching braking points and corners. Combined with effective airflow and a secure, adjustable fit, this helmet offers dependable comfort and protection session after session.

Key Features

  • Multi-layer composite shell construction: Reinforced composite shell provides reliable impact protection while maintaining a manageable weight to reduce neck fatigue.
  • Sliding visor mechanism: Smooth and precise visor adjustment system, paired with a 3mm FIA-approved clear visor for consistent visibility in varying conditions.
  • Enhanced downward field of view: Redesigned eye port increases vertical visibility, improving awareness of the track surface through braking zones and corner entry.
  • Cheek comfort padding design: Specially shaped cheek pads improve lateral support and stability, with interchangeable options available to fine-tune the fit.
  • Top ventilation holes: Strategically positioned vents across the crown allow airflow over the head, helping reduce heat build-up during long sessions.
  • Three shell size system: Helmet sizes from 54–64 are produced across three shell sizes to achieve a more proportional fit with less excess bulk.
  • FIA-approved 3mm visor: Provides certified optical clarity and impact resistance for reliable vision at speed.
  • Improved cheek stability: Internal shaping around the lower face enhances helmet stability during acceleration, braking, and rapid direction changes.

Approval: FIA 8878-2024 & Snell K2025 Certified.

Additional information

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Approval

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Material

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Helmet Size

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Product Type

Interior Lining Colour

Karting helmet size guide

Kart helmet sizing is model by model rather than brand by brand. Sparco alone run six different ladders across their kart range, and none of them matches their car helmet ladder. The good news is that every size on this site carries the head measurement inside the size name, so you can ignore the letter completely.

Read the number, not the letterOur size options are written like “M (57cm-58cm)”. Measure your head once and pick the option whose centimetre range contains your number. That is all you need to do, and it works across every brand and model on the site.

Measure the head

1One inch above the eyebrowsThen round the widest part at the back. Soft tape, level all the way round.
2Take the largest readingMeasure three or four times and use the biggest number you get.
3Hair as you driveMeasure with the hair down or tied as it will be under the helmet.
4Children grow, helmets do notBuy to the measurement today. A helmet bought big to last two seasons moves on the head, and you will be replacing it anyway when it is outgrown.

The homologation decides how big the helmet goes

This is the thing that catches parents out. Snell-FIA CMR is the junior standard and every CMR helmet we stock stops at around 59 cm, because it is designed for a child. If your driver measures more than that, a CMR helmet does not exist in their size and you need a CMS, a Snell K or an FIA 8878 helmet instead. Check which your series accepts before you shop.

Helmet Homologation Size range
Snell-FIA CMR 2016, the junior standard
Bell KC7-CMR Snell-FIA CMR 2016 54 – 59 cm
Bell KC7-EV CMR Snell-FIA CMR 2016 51 – 59 cm
Stilo ST5 CMR Snell-FIA CMR 2016 54 – 59 cm
Stilo ST6 CMR Zero and Lite Snell-FIA CMR 2016 53 – 59 cm
Sparco Stealth CMR Snell-FIA CMR 2016 53 – 59 cm
Sparco GP KF-4W CMR Snell-FIA CMR 2016 54 – 59 cm
Arai CK-6 Snell-FIA CMR 2016 51 – 60 cm
Stilo ST5F N KRT Snell-FIA CMR 2016 54 – 64 cm
Snell-FIA CMS 2016, the same shell for seniors
Bell KC7-EV CMS Snell-FIA CMS 2016 51 – 59 cm
Bell Carbon KC7-CMR Snell-FIA CMS 2016 52 – 59 cm
Senior kart standards
Stilo ST6 KRT FIA 8878-2024, Snell K2025 54 – 64 cm
Bell RS7-K Snell K2020 54 – 61 cm
OMP GP-R K Snell K2020 52 – 63 cm
Arai SK-6 Snell K2015 53 – 62 cm
Sparco Air KF-7W, Sky KF-5W Snell K2015 53 – 62 cm
ECE 22-06, practice and arrive-and-drive
Sparco X-Pro ECE 22-06 53 – 63 cm
Sparco Club X1 ECE 54 – 65 cm
OMP Circuit Evo 2 ECE 22-06 53 – 61 cm

ECE 22-06 helmets are road motorcycle homologated. They are popular for practice, arrive-and-drive and indoor karting, and they cover the widest size range, but most competition series will not accept them. Check your regulations first.

Ladders by brand

All measurements are head circumference in centimetres.

BellNumeric on most kart models. Pick your measured size.▼
Model Sizes
KC7-CMR 54, 55, 56, 57, 58, 59
KC7-EV CMR and CMS 51, 52, 53, 54, 55, 56, 57, 58, 59
Carbon KC7-CMR 52, 53, 54, 55, 56, 57, 58, 59
RS7-K Carbon 54, 55, 56, 57, 58, 59, 60, 61
RS7-K S 57-58, M 58-59, L 60-61, XL 61 to 61+
StiloLettered, and the ST6 KRT offers two different L liners.▼
Model Sizes
ST5 CMR XS 54, S 55, M 57, L 59
ST5 CMR Carbon XS 54, S 55-56, M 57, L 59
ST6 CMR Zero and Lite XXS 53, XS 54, S 55, S 56, M 57, L 59
ST6 KRT XS 54, S 55, M 57, L 58, L 59, XL 61, XXL 63, XXXL 64
ST5F N KRT XS 54, S 55, M 57, L 59, XL 61, XXL 63, XXXL 64

Stilo state their helmets run slightly smaller than other brands, so if you are on a boundary go up. The ST6 KRT lists an L at 58 cm and an L at 59 cm; those are two liner thicknesses in the same shell.

SparcoSix different ladders. Read the centimetres in the size name.▼
Model Sizes
Stealth CMR XS 53-54, S 55-56, M 57-58, L 59
GP KF-4W CMR XS 54-55, S 56, M 57-58, L 59
Air KF-7W, Sky KF-5W XS 53-54, S 55-56, M 57-58, ML 59, L 60, XL 61, XXL 62
X-Pro S 55-56, M 57-58, L 60, XL 61, XXL 62
X-Pro Gulf and Martini XS 53-54, S 55, M 56-57, L 58-59, XL 60-61, XXL 62-63
Club X1 Carbon XS 54-55, S 56-57, M 58-59, L 60-61, XL 62-63, XXL 64-65

None of these matches Sparco’s car helmet ladder, and several do not match each other. A Sparco kart M can be 56-57, 57-58 or 58-59 cm depending on which model you are looking at.

OMP and AraiBoth use the same ladders as their car helmets.▼
Model Sizes
OMP GP-R K XXS 52-53, XS 54-55, S 56-57, M 58-59, L 60-61, XL 62-63
OMP Circuit Evo 2 XS 53-54, S 55-56, M 57-58, L 59, XL 60, XXL 61
Arai CK-6 XXS 51-52, XS 53-54, S 55-56, M 57-58, L 59-60
Arai SK-6 XS 53-54, S 55-56, M 57-58, L 59-60, XL 61-62

How it should fit

Snug enough that it is slightly awkward to pull on, with the cheek pads pressing the cheeks up. With the strap done up you should not be able to rotate the helmet forwards off the head. The lining beds in over the first few sessions, so a helmet that feels merely comfortable in the box will be loose by the end of the season.

For a child, check it again at the start of every season rather than assuming last year’s helmet still fits. Heads grow faster than you expect and the fit goes off before the helmet looks any different.

Tell us the series as well as the measurementHead circumference in centimetres and which championship or club you are running in. The homologation narrows the choice more than the size does, and we would rather get both right at once. Call 0115 989 3488 or email Sales@GSMPerformance.co.uk.

Ladders read from the size options on our own products, which carry the head measurement in the size name. Bell numeric models follow Bell’s published HP, Carbon and Pro chart. Arai and OMP kart ladders match their published car ladders. All checked 2 August 2026.

Offer 1: Pick your free gift!

  • Offer 1: Pick your free gift.
  • We're giving away free gifts when you purchase any racing helmet over £400.
  • Simply add your helmet of choice to your basket, and checkout.
  • A popup will then appear, where you can pick which free gift you want to receive. It's as easy as that!

Offer 2: Automatic free gift!

  • Offer 2: Automatic free gift.
  • We're giving away a gift box full of goodies or a face mask with every order.
  • Simply pick which one you want on the checkout screen

Offer 3: 10% off racing suits!

  • Spend over £500.00 on any FIA racing suit and receive an instant 10% discount.
  • Simply add your suit of choice to your basket and checkout.
  • Your 10% discount will be instantly added to your product. No product code needed!

Offer 3: 5% off your first order!

  • Spend over £150.00 on checkout and receive an instant 5% discount on your first order with GSM Performance.
  • Add the code: New-GSM5 in your shopping basket and the discount will be instantly added to your product entire order.

At GSM Performance, our priority is to maintain the utmost hygiene and quality standards for the benefit of our customers. To that end, we have instituted a policy that all purchases of long johns, balaclavas, tops, and underwear are final and non-returnable. This policy is necessary due to the personal nature of these items, which are worn in close contact with the body. This protocol is intended to guarantee the health and safety of all our customers.

This policy adheres to the best industry practices and safeguards both our customers and our staff. It's important to clarify that this policy does not affect your statutory rights as a consumer. This policy does not apply if you receive damaged or defective products. In such cases, our customer service team is available to promptly address your concerns and arrange a replacement or refund. We greatly appreciate your understanding and adherence to our hygiene policy and thank you for your continued confidence in GSM Performance. For further information please see our terms and conditions which are agreed on checkout. 

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