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Smith Jetstream TT Bike Helmet

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Low Drag

Cutting an aggressive aerodynamic profile that makes its intentions clear from a mile away, the Smith Jetstream TT Bike Helmet is a zero-compromise piece of equipment for stage racers and triathletes. The integrated lens replaces your sunglasses, creating a seam-free fit that reduces aerodynamic disturbance at speed, and this system includes two lenses to adapt to changing light conditions. However, since having the motor overheat isn’t an option on race day, it also gets a surprising amount of cooling airflow for a helmet in this class, which is aided by Smith’s use of KoroydⓇ to enhance breathability without compromising protection. When a handful of watts makes the difference between sweet victory and bitter defeat, you’ll be glad to have this helmet in your arsenal. 


  • Integrated helmet and eyewear system for triathlon and time trial use
  • Zonal KoroydⓇ and MIPSⓇ combine to maximize protection
  • Magnetic lens attachment includes both a ChromaPop™ and a clear lens
  • Five vents for more airflow than most aero helmets
  • Ionic+Ⓡ odor-resistant lining keeps helmet feeling fresher for longer
  • VaporFit™ adjustment dial for a secure, customized fit


  • Gender: Unisex
  • Best Use: Road Cycling, Time Trial, Triathlon
  • Weight: 14 oz (Size Medium)
  • Safety Certifications: CPSC, CE EN 1078
  • Size: [Small] - 51-55 cm, [Medium] - 55-59 cm, [Large] - 59-62 cm
  • How to Measure: Measure around the head about 1 inch above the eyebrows