I'm fine with the Sugoi mid-zeros at 45. 50 might be pushing it, but if it's windy and cloudy, yes, I'd be wearing tights. Last fall I did a ride on the south coast, about 40 miles. It was super windy and we hugged the ocean. I as wearing a thermal LS jersey, but at times I had to put my wind jacket on. I am sure the temperature was in the fifties, but I needed those tights.