Alpinestars Vest Bio-plasma LtEngineered for all forms of off road riding Optimized to deliver effective impact protection while still allowing a high degree of freedom of movement The main chassis is constructed from a soft tactile highly breathable stretch mesh fabric for optimized cooling performance Stretch and vented moisture wicking base layer, with abrasion resistant outer textile over the protector pockets for superior durability Side zipper for ease of use and comfort YKK