I ordered the SM size because I'm 5'5", 115 lb. It fit's over my jacket and has elastic straps with buckles to adjust the tightness around the waist. It fits great. The color is nice - fluorescent yellow and very bright! The vest is a little different than pictured. The image on the website makes the back of the vest appear to be less V-shaped than it actually is. You actually have much less Hi-Viz fabric than what it looks like in the pic, so although I like the V-shape styling, I believe it offers less Hi-Viz protection. There is reflective material at the shoulders and waist. It would have been better if the Rev-It log on the front and back was also reflective material. It comes in a very nice pouch with a tension toggle to close it. Overall I really like this vest and I would recommend it if the price was about under $30.