Troy Lee Designs A3 MIPS Bike Helmet

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So comfortable you won't want to take off—even on long climbs—the Troy Lee Designs A3 MIPS mountain bike helmet features 16 cooling vents, plus the coverage and protection to tackle any descent.


  • Awarded 5 out of 5 stars by the Virginia Tech helmet safety lab, this helmet lets you feel confident in all conditions
  • Patent pending EPP (low speed) and EPS (high speed) impact foams help with impact energy management
  • Rotational motion can cause brain injuries; with MIPS, a low-friction layer slides 10 to 15 mm in all directions, reducing rotational motion to the brain during impact
  • Patent pending, 3-way position Magnajust™ magnetic visor keeps sun out of your eyes while allowing for google stowage
  • TLD Sweat-Glide™ system helps keep perspiration from reaching your eyes
  • Custom 3D Fidlock® magnetic strap buckle offers easy operation and secure fastening
  • 2-piece X-Static® comfort liner features cut lines for a customizable fit
  • 16 vents take in cool air and exhaust hot air
  • Advanced 3-part outer shell creates a technical look
  • Smart-shear side visor screws with anodized aluminum washers
  • Easy-adjust side strap harness makes it easy to place side straps in the most comfortable position


To find your size, position a tape measure just above your ears and about 1 in. above your eyebrows. Keep the tape level to measure the circumference around the largest part of your head and then find the corresponding size in the Technical specs info.
View all Troy Lee Designs Mountain Bike Helmets

Technical Specs

Best Use

Mountain Biking

Helmet Style

Mountain Bike

Helmet Construction


Shell Material

Polycarbonate-reinforced shell liner






13.9 ounces



22 reviews with an average rating of 4.6 out of 5 stars

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