The Louis Garneau X-Lite claims the spot as the world's lightest helmet that still retains a true retention system. Despite tipping the scale at a mere 190 grams, the X'Lite is no lightweight when it comes to protection. Garneau's Super MSB technology employs ring-shaped reinforcement around the base of the helmet, strengthening the perimeter around critical impact zones. The main 'dome' section uses Garneau's U-bar technology, featuring strong, six-sided plastic ribs that act like an exoskeleton and reinforce the helmet structure. The super-light, Spiderlock SL retention system dials in a perfectly circular fit with a single-handed turn of a dial. The fit snugs in all around, not just from front to back. 37 channels promote increased airflow to export heat and moisture. SM (52-56cm), MD (56-59cm), LG (59-62cm).