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Troy Lee Designs
A1 MIPS MTB Helmet

Mfg PartNum:
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Backorder: This item is currently out of stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

Fit, Protection, Style

Styling, graphics, fit, function, and safety are key in everything Troy Lee Designs creates, and all of these factors certainly went into the A1 MIPS MTB Helmet.

After years of research and development, Troy Lee Designs Team made one of the most comfortable MTB helmets on the market and updated it to be even safer than previous models with the addition of MIPS rotational brain protection.

This lightweight, fully encapsulated all-mountain helmet utilizes maximum coverage and dimension to keep you safe and protected in all riding conditions. Whether you're charging singletrack, riding dirt jumps or grinding out miles on the XC bike, the A1 helmet offers the premium fit, protection, and style you want.

"The A1 Classic MIPS Helmet takes top safety honors, earning a perfect 5-star rating in Virginia Techs impact test and was the number one tested mountain helmet."

—VA Tech Helmet Testing Lab


  • Featuring MIPS Brain Protection System - a helmet integrated, low friction layer designed to reduce rotational motion transferred to the brain from angled impacts to the head
  • EPS impact liner maximizes impact protection while minimizing weight
  • Innovative break-away visor screws
  • 16 port hi-flow cooling system both pulls and pushes air for maximum ventilation
  • Ultra-plush quick-dry comfort liner is both removable and washable for maximum ventilation
  • Adjustable, cam-lock strap dividers allow customization for different head shapes and riding styles

  • Free Exchanges: This product qualifies for free exchanges within the first 60 days after order. We'll cover the shipping both ways for US customers if you need a different size and/or color of this product. Returned product must be in new condition with all labels and packaging. Free exchanges apply only for product in stock or available for backorder.

    B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.


    Safety: MIPS Brain Protection System 


    Liner: EPS impact liner 


    Discipline: Mountain Biking / Off Road 


    Certification: CPSC 1203,* CE EN1078,* *Varies by regional standards 


    Fit System: Adjustable, cam-lock strap dividers 


    Vents: 16 

    Classic Grey/Green - S

    Mfg PartNum: 190258011 

    Classic Grey/Green - M/L

    Mfg PartNum: 190258013 

    Classic Grey/Green - XL/2XL

    Mfg PartNum: 190258015 

    Classic Black/White - S

    Mfg PartNum: 190111151 

    Classic Black/White - M/L

    Mfg PartNum: 190111153 

    Classic Black/White - XL/2XL

    Mfg PartNum: 190111155 

    Classic Black/Red - S

    Mfg PartNum: 190111161 

    Classic Black/Red - M/L

    Mfg PartNum: 190111163 

    Classic Black/Red - XL/2XL

    Mfg PartNum: 190111165 

    Classic Black - S

    Mfg PartNum: 190258001 

    Classic Black - M/L

    Mfg PartNum: 190258003 

    Classic Black - XL/2XL

    Mfg PartNum: 190258005