The Endura MT500 Helmet with Koroyd Technology is a high performance Enduro style mountain bike helmet with wide adjustment visor. The MT500 helmet uses 3D formed Koroyd inserts for enhanced airflow and improved energy absorption in an incredibly lightweight package. It is one of the most breathable and lightweight enduro helmets on the market while also providing superior impact protection over standard construction.  Endura MT500 Helmet with Koroyd Technology Features High performance Enduro style mountain bike helmet with wide adjustment visor Integrated Koroyd for superior lightweight breathable protection Clip on accessory mount Large vents including top 'air intake' zone for increased airflow Fully goggle compatible including rear strap clip Front eyewear dock One-hand micro-adjustment fit system Antibacterial fast wicking padding Covered by Endura's Crash Replacement Policy and Endura's Product Guarantee