Once-saturated-with-water-the-Challenger-vest-rsquo-s-natural-cooling-properties-are-activated-simply-by-opening-the-jacket-rsquo-s-ventilation-panels-which-helps-riders-maintain-a-comfortable-body-temperature-&-ultimately-stay-in-control-The-Challenger-can-be-zipped-directly-into-select-REV-rsquo-IT-jackets-for-a-clean-integrated-fit-mdash-effectively-amplifying-a-jacket-rsquo-s-existing-airflow-for-up-to-six-hours-User-instructions-Cooling-products-with-Hyper Kewl-trade-Before-the-first-use-please-dunk-the-product-under-water-gently-squeeze-out-the-excess-water-&-let-the-product-dry-completely-This-is-necessary-for-the-cooling-fibers-to-set-into-the-product-Please-note-the-product-could-feel-39-slimy-39-because-of-the-fiber-migration-after-the-first-activation-This-rinses-away-on-the-next-soaking-Challenger-Cooling-Vest-S-M-L-XL-Men-39-s-Textile-jacket-XS-S-M-L-XL-XXL-XZL-Men-39-s-Leather-jacket-46-48-50-52-56-58-60-Ladies-Textile-jacket-34-38-40-42-44-46-48-Ladies-leather-jacket-34-38-40-44-46