Now this is really using your head...to increase visiblity, warmth and head protection! OccuLux Hi-Viz Knitted Cap features bright fluorescent, hi-viz lime yellow or orange colors, in super warm, super soft, high quality polyester fabric. Design features a 360 stripe of 3M Reflective silver thread for added visibility from a distance. Lightweight to carry and easy to slip on. One size fits all. Wear with or without a hard hat. Machine washable. Available in Hi-Viz Lime Yellow and Hi-Viz Orange.