The Limar Ultralight Pro 104 Helemt is said by the company to be the worlds lightest helmet while weighing in at 170 grams in a size medium, and 200 grams for a size large.
With the lightness of the Limar Ultralight Pro 104 road cycling helmet comes 22 vents, which assists in keeping your head cool, and micrometric fitment system that uses a thumb wheel to adjust. Not only is their a road helmet, but a mountain bike one is available as well.
Available in blue white, silver white, carbon, red white, and white. Retail is about $193 USD.