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HJC Adwatt 1.5 TT Triathlon Helmet


The HJC Adwatt 1.5 Triathlon Helmet strikes the perfect balance between aerodynamics, ventilation and comfort for particularly long rides... Read more

Matt BlackMatt Black
SKU: HJC81352701


The HJC Adwatt 1.5 Triathlon Helmet strikes the perfect balance between aerodynamics, ventilation and comfort for particularly long rides.

HJC used the hour record winning Adwatt helmet model as the base for the 1.5 Using enhanced wind tunnel testing at the South Korean company’s bespoke facility in Seoul, the triathlon helmet is tailored for the drag force that is exerted on the helmet out on the road.

The helmet keeps your head cool thanks to advanced air channels and Venturi dynamics which suck cool air through the helmet’s front vents and expel them through the rear vents, ensuring a constant flow of cool air over your head.

X-Static® fabric is used inside the helmet to keep the Adwatt 1.5 and your head fresher for longer. The fabric is made by permanently bonding 99.9% metallic silver to fibres.

The helmet is complete with a removable mirror shield for maximum aerodynamics. With the shield, the helmet is a featherlight 320g. Without the visor, it is 260g.

Key Features

  • Wind tunnel tested triathlon helmet
  • Aerodynamic design
  • Venturi Dynamics
  • In-mould construction
  • Advanced air channel
  • Mirror shield
  • X-Static® fabric
  • Adjustable wide divider
  • 320g (±10) (including shield)



Small 51-56cm 20-22"
Medium 55-59cm 21.6-23.2"
Large 58-63cm 22.8-24.8"


The choice of teams AG2R Citroën and Israel Start-Up Nation, HJC cycling helmets are designed, wind-tunnel tested and manufactured in-house, combining aerodynamics, cooling, low weight and safety for outstanding performance. Founded in 1971 and the world's biggest manufacturer of moto helmets for almost two decades, the HJC team knows exactly what it takes to deliver quality protection.Read more about HJC.


Founded by real cycling enthusiasts in 2004, our passion for elite performance runs through everything we do at Saddleback. Our team of dedicated roadies, mountain bikers and triathletes practice what we preach to bring you the finest cycling products and a superior service to match. We're the official UK home of Castelli, Chris King, ENVE, HJC, Moots Cycles, PUSH, Sidi, Silca, Sportful, Stages, Troy Lee Designs and Wolf Tooth.


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