Alpinestars MX Cooling Vest (Black/Red, Large) Designed to keep the wearer cool during sporting activities in warm weather Garment uses a water management system, which uses an exclusive polymer embedded material that has been specially designed to absorb and slowly release water within the multi-layered fabric This process significantly enhances the bodys ability to stay cool To use, submerge the vest in water for 5-10 minutes, then remove excess moisture by squeezing the vest before wearing Vest remains hydrated for several hours; can be re-hydrated as needed