Ergodyne Chill-Its 6685 Lime Dry Evaporative Cooling Vest, X-Large IMMEDIATE AND LONG LASTING COOL RELIEF Fill with water (13-20oz) and enjoy instant relief from the heat! Cooling can last up to 3 days depending on environment's humidity and air temperature. High humidity levels can slow down airflow and may reduce cooling abilities. DURABLE COOLING OUTERWEAR Machine washable and can be reused over and over again. Industrial grade quality nylon - made to perform in the toughest environments. PATENTED DRY EVAPORATION This exclusive technology keeps wearer completely dry and comfortable during the entire evaporative cooling process. VENTILATED COMFORT Shorter length and mesh side panels provide additional mobility and breathability to the wearer. SNUG FIT Sizes from Medium to 4XL available