I bought these with the matching pants to use for walking in cold weather. They are really warm. With cloud cover and wind chill in the mid 20's I had to change out my polyester light weight fleece lined jacket after 5 minutes and put on a nylon polyester lined wind breaker to wear over a t-shirt and this top. At the end of my 45 minute slow walk the wind died down, the sun came out, and temps got into the mid 30's and I started to sweat. I won't wear these again unless temps and/or wind chill are going to stay below freezing.