I have some hi-viz t-shirts, but they are getting old. In my last tour, I needed a new helmet. Since my wife was coming to spend the weekend with me, I asked her to get me one. The local bike shop gave her two different ones for me to try. I chose one that was hi-viz yellow, and I love it. She also brought me a hi-viz, mesh vest. I didn't ask for it, but I found I really like it. It was comfortable, and did not make me feel hotter. It wadded up into a very small space if I chose to not wear it. I guarantee I am more visible with it, than without.