GT Siren 16"

Introduce the rider you are today to the one you’ll be tomorrow. The Edge® 540 cycling computer offers targeted adaptive coaching when used with your compatible power meter and heart rate monitor.

Six years ago, Giro set a new standard in quality, look, and feel in a recreational helmet with the original Register. The Register II takes this to the next level by bringing styling and venting of Giro's high end road helmets to this lightweight helmet.

Instant bike rack cred.

Perfect for surfers who like to ride more than just waves.