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Troy Lee Designs A3 MIPS Uno MTB Helmet

The Troy Lee A3 MIPS MTB Helmet is the pinnacle of protection and comfort in mountain bike helmets. The A3 Helmet features 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. The 2-piece Ionic antimicrobial, sweat wicking liner, in combination with 16 optimally tuned tuned vents work to keep your noggin cool even on the toughest of trails.


  • Reinforced polycarbonate shell
  • Dual-density EPP/EPS liner
  • MIPS Brain Protection System
  • Advanced layering 3-piece shell
  • 16 port hi-flow cooling system both pulls and pushes air for maximum ventilation
  • TLD Sweat Glide System
  • 2-piece, removable and washable comfort liner made of anti-microbial moisture-wicking material for a dry, comfortable feel
  • 3-way Magnajust visor
  • 3D Fidlock magnetic buckle system and composite smart shear screws
  • CPSC 1203, CE EN 1078, AS NZ 2063 certified
  • Bicycle use only, not DOT-approved and not intended for use with motorcycles
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Product Style Item # Store SKU Manufacturer Product # Availability
Product Style Black / XS/SM Item # 10134024 Store SKU Manufacturer Product # 150267001 Availability Available: Ships in 3-5 business days
Product Style Black / MD/LG Item # 10134025 Store SKU Manufacturer Product # 150267003 Availability Available: Ships in 3-5 business days
Product Style Black / XL/2XL Item # 10134026 Store SKU Manufacturer Product # 150267005 Availability Available: Ships in 3-5 business days
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