Have you ever stepped out of a swimming pool or shower and felt a chill, even in the heat? That’s evaporation at work. Trigger warning: Science (yes, we’re a bunch of nerdy scientists). Evaporation is an endothermic process, meaning those water molecules steal heat from your skin to transform into vapor. The result? Instant cool-down mode. Now, meet the Roamwell Chill. From the same folks who engineered ultra-light travel meds for all your on-the-go health needs, we’ve crafted this high-performance, low-weight travel cooling towel — weighing in at just under 2 ounces and complete with a handy carabiner. (Because, let's be honest, ounces add up.