The SIXSIXONE Core-Cooler PCLPs along with our special combination of fabrics create a two-stage cooling system keeping the user cool. Cools by evaporation, as water vapor is released around the upper body. The effect is an overall increase in energy and comfort. As the water vaporizes away, the SIXSIXONE Core-Cooler loses weight but maintains it's full cooling capacity. The inner liner poly-suede material gives a soft non-abrasive feeling and creates a heat sync against the skin, which rapidly cools heat radiating to the body surface. Fully hydrated will cool up to 5 days on a single soaking and weigh only 1-1/4 lbs. Dry to the touch after soaking and will not wet your clothing. Ergonomic shape makes for a comfortable fit. No need to refrigerate! Cools itself through evaporation. Soaking for 5-minutes will offer light-weight cooling power for a long moto or all day. 10 to 20 minutes will cool for up to 48 hours.1-2 hours will fully charge and last up to 5 days.