The Chill-Its 6283 Rechargeable Phase Change Pack quickly activates to keep workers cool, productive and safe in the heat. This pack is specifically designed for compatibility with the Chill-Its 6483 Cooling Neck Gaiter-simply insert the activated pack into the interior back-of-neck pocket for up to 2 hours of enhanced cooling. Unlike traditional ice vests that freeze solid and become bulky, uncomfortable and short-lived, this cooling vest harnesses the power of Phase Change Material (PCM)-an advanced technology designed to absorb and release heat at a controlled temperature. What is Phase Change technology. Unlike ice-based cooling, PCM cold packs stay at an optimal cooling point without the risks of ice burn or extreme cold, delivering steady, long-lasting relief in high-heat environments. No dripping, no freezing-just consistent cooling when it matters most. Learn more about Phase Change Cooling and other technologies here. Ideal for construction, landscaping, roofing or anyone working in the heat. This phase change charge pack can also be used to keep cool and reduce the risk of heat stress during recreational activities such as gardening, hiking, fishing and more. Color: Clear.