Has superior breathability. Reduces the risk of heat stress. Are the most comfortable in the industry. Wicks away moisture. Comes in 3 weights 4.5 oz. (7.3 ATPV Rating), 5.3 oz. (9.5 ATPV Rating), and 6.4 oz. (10.1 ATPV Rating). Offers both CAT 1 (4.5 oz.) and CAT 2 (5.3 oz. and 6.4 oz.) protection. Inherently flame resistant. Solution dyed. Wickzz™ proprietary finish to eliminate moisture in garment. Protects against flash fire and arc flash hazards.