Lightweight and Highly Breathable! Bontrager XXX Helmet [Triathlon & Road Bike Compatible] Thank you for viewing. This is an offering for the high-performance model "Bontrager XXX Helmet (Size: 55-61cm)" from TREK. It is lightweight and highly breathable, making it ideal for summer training and triathlon races. Of course, it can also be used comfortably for regular road bike rides. Brand: Trek Model: Bontrager XXX Size: 55-61cm Color: Yellow (High visibility, good for safety) Production: June 2019 Usage: Only a few times (No crashes, stored indoors) The condition is good, and the straps and pads are also in good condition. Recommended for those looking for a lightweight model or those who are just starting triathlon!