I've used these for a few weeks now in temperatures down to the low 30's Fahrenheit and I have been completely comfortable in fit and body temperature. They are particularly good at resisting wind, which aids in riding comfort in chilly weather. I've washed them several times now with the washing machine in "hand wash" cycle and then hung to dry and have not observed any issues with seams or colors. I am 5-foot, 5-inches tall and weigh 133 pounds and the small fit me well (although the suspenders seem a bit tight, but they are stretchy enough that I can adjust everything by pulling up or down). If you're any bigger than me, you'd want to move up to a medium as I felt like I was at the limit for the small.