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The AllMtn 4.0 helmet delivers DH-certified protection in a lightweight, open-face design for aggressive trail and e-MTB riders.
The AllMtn 4.0 helmet delivers DH-certified protection in a lightweight, open-face design for aggressive trail and e-MTB riders.
Leatt

Leatt AllMtn 4.0 Mountain Bike Helmet in Stealth Black/Grey

£169.00
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Pre-Order

With Pre-Order, you can purchase the latest items added to our store in advance of them arriving with us.

Your Pre-Order is prioritised (at no additional charge); meaning that as soon as the product arrives with us, we can wrap it straight back up; ready for collection via Click & Collect or despatch to you — it often never even hits the stock room shelves!

Pre-Launch

With Pre-Launch, the date when we expect to receive the product ourselves is still a little too hazy to be confident in accepting Pre-Orders.

So, instead, you can submit your email address against the item you are interested in and we will email you as soon as stock arrives on the system.

Estimated Delivery & Collection Dates

Estimated Delivery & Collection Dates are given on Pre-Order and Pre-Launch products. They are for indication purposes only and can change at any time without notice.

The dates we provide are based on indications given by our suppliers. Whenever we get updated information from our suppliers we will endeavour to update the Estimated Delivery & Collection Dates provided on product pages.

We estimate this will be ready for despatch to you or collection via Click & Collect on Undetermined
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Hassle free returns

In the unlikely event that you are not satisfied with your purchase please feel free to return your items within 90 days of the purchase date for a full exchange or refund. Any item (excluding food, underwear or e-gift vouchers) can be returned to us for any reason within 90 days, provided that the item has not been used or fitted and is returned in its original packaging with valid proof of purchase.

It is recommended that you use a recorded delivery service or return to a store to ensure your items are received by us. We cannot assume responsibility for items that are lost in transit back to us.




Terms & Conditions

Items must be returned in their original packaging and unused. Refunds will be issued once the product(s) have been received and inspected.

Click & Collect customers can buy with confidence knowing that they can review the item before deciding whether it is right for you before leaving the store. Should you decide it's not right for you, it can be conveniently exchanged or refunded straight away, or you still have up to 90 days to return it if you are still unsure.

Please note:
1. If the items we have sent you are faulty, damaged or not as we described, we will cover the cost of collection and the delivery of the correct item.

2. If we have delivered the correct bike but upon inspection, you decide the bike is not the one for you, we will charge you £50 for collection (£100 from Northern Ireland). If you do not have the original box in usable condition, we will charge you an additional £15 to provide one.

Refunds will be processed using the same method of payment used for the original purchase. Credit & debit card refunds must be made to the card used for the original purchase.

We are unable to offer a refund without a valid proof of purchase.

Leatt AllMtn 4.0 Mountain Bike Helmet in Stealth Black/Grey

Season:All Year Round

Brand:Leatt

Code:LE102301515Stea

The AllMtn 4.0 helmet delivers DH-certified protection in a lightweight, open-face design, giving aggressive trail and e-MTB riders downhill-level impact protection. Built with in-molded EPS + EPO impact foam for enhanced energy absorption, it is certified to ASTM F1952-15 (downhill MTB) and NTA 8776 (e-bikes going up to 45km/h / 28 mph) standards, making it an ideal choice for aggressive rides and e-MTB adventures. The mountain will call you at one point or another, so be prepared! A universal sunglasses dock lets you safely dock your sunglasses under the visor when not in use, protected from scratches and unwanted impacts. The adjustable visor opens up enough to place your goggles underneath, so you do not have to constantly remove them. You will also love the convenience of the Fidlock buckle system.

Leatt helmets feature 360 Turbine technology reduces both rotation acceleration and concussion level impact energy to your head and brain! Do not be afraid to push your limits. Gear up and be prepared for whatever is waiting along the trail. Leatt's 360° Turbine Technology helps reduce rotational forces and absorb low-speed impact energy, while the impact foam provides high-speed impact protection, working together as a 3-in-1 safety system. The modern profile meets the highest safety standards, yet it remains lightweight and breathable, with a moisture-wicking liner to manage sweat. A Fidlock magnetic buckle makes for easy one-handed closure, and the adjustable breakaway visor adds another layer of protection in a crash. With a secure fit system, integrated eyewear dock, and sleek design, the AllMtn 4.0 is built for riders pushing the limits.

Product Details:

  • Shell: Lightweight polymer shell
  • Impact Foam: In-molded EPS + EPO impact foam for superior energy absorption
  • 3-in-1 Safety System: When combined with the impact foam, 360° Turbine Technology offers a unique 3-in-1 safety system by protecting against low-speed impacts, high-speed impacts, and rotational forces.
  • Turbines: 360° Turbine Technology. Rotation protection: The optimally designed turbine discs enable the helmet to move slightly on the head upon impact, helping to reduce peak acceleration to the head and brain. Low impact protection: The special energy absorbing material in the turbines absorbs low impact energy associated with concussion.
  • Ventilation: 18 vents effective even at low speeds
  • Liner: Moisture wicking, breathable, anti-odor and washable inner liner
  • Fit System: Flat Lock Strap divider and fit system developed for custom fit, ease, and comfort
  • Closure: Fidlock magnetic closure system
  • Visor: Adjustable visor with breakaway function for rotational impact force reduction
  • Other Features: Sunglasses dock port for easy, secure storage. Soft touch and moisture wicking chin straps. Plastic-free packaging.
  • Weight: From 430g (0.95 lbs)
  • Certifications: AS/NZS 2063:2008, EN1078, CPSC 1203, ASTM F1952-15, NTA 8776 (Helmets for S-EPAC riders)
Sizing Information

Size Guide

Refer to the chart below for helmet sizing.

Helmet MTB size chart
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