Alpinestars Vector Pro Delta Helmet. Lightweight and strong, the Vector Pro helmet has been designed for MTB use. Featuring 19 openings for effective ventilation, with a reinforced air scoop at the front for additional strength, the Vector Pro offers extended coverage around the temple and nape areas for enhanced levels of rider protection. Other design features include reinforcing cages embedded in the rigid frame for added strength, a quick release chin strap, a fully adjustable dial sizing system, a washable, replaceable and breathable comfort liner with quick-dry anti—bacterial fabric and an adjustable visor, which can be tilted forwards for enhanced vision when riding uphill and has space to facilitate the safe storage of goggles. Available in three shell sizes: small, medium and large.