Giro Prolight Road Helmet In-Mold construction provides strength, integrity and is so lightweight, you'll have to remind yourself that you've got a helmet on at all 25 Wind Tunnel vents with fully optimized internal channels thrust cool, fresh air over and around your head while forcing heat and stale air out Impact absorbing, antimicrobial X-Static padding offers unprecedented comfort and manages moisture Roc Loc SL retention system with featherweight webbing and a 3-position fore/aft system adjustment, self-adjusts to provide a comfortable, secure fit