I love the material of this jersey. I have a couple of the short sleeve ones in this style as well. I would say they are true to size and do not run small as some other Pearl Izumi items do. This jersey is quite lightweight, so it will not work on its own for colder weather. I wear it in the 55-65 degree range.This is a nice bike jersey but the material is very thin. The colors are nice and it fits fine, but it's not for super cold weather. I wear this in the spring and fall, but not when it's super cold out.These jerseys work well for me. They wick and keep my arms warm on cooler biking days. This is the second one I purchased. Worn over a wicking short sleeve, the full length zipper allows for excellent temperature control on chillier days. I can just zip up or down without having to get off of my bike.Great lightweight jersey. I think I can wear this in cool weather and in the summer for sun protection on my arms. I don't like my bike jerseys too tight, so although I am a medium according to the size chart, I ordered a large and like how it fits. (5'3", 130 lbs for reference).I'm 5'3" 125lb. I normally wear a small and this fits well. It's very thin so it's a good 50-60 deg weather top to shield you from the sun.Very very thin fabric and floppy. Fit was off with overly large sleeves and the sleeve length was too long too. Returned.Love this shirt. I got a large. I'm.5'6"and about 150 lbs. Shirt is not too tight and really pretty.The material is fantastic.It is perfect. I love this shirt