The StaCool Vest Core Body Cooling System, now available in luminescent safety colors, helps workers beat the summer heat. Fully adjustable models are available in safety yellow, orange, and green to wear over normal clothing, providing all-day comfort. Under-vests are also available, to be worn under other clothing. Micro-thin, highly breathable materials provide wearers unsurpassed cooling comfort and mobility. ThermoPaks around vest provide hours of cooling; a spare set of ThermoPaks are included with each vest. A thermal barrier is built in to ensure wearer does not get too cold.