UV killer treated blaze orange vest is seen as a shade of yellow by deer and other dichromate's while appearing as bright, blaze orange to the human eye. U-V-Killer kills the ultraviolet fluorescence glow on this blaze orange vest and increases the fade resistance of the high- visibility orange. It is sealed in a factory- applied fluorocarbon water and stain repellent to keep the U-V-Killer in place. 600 sq. in. One size fits all.