This is a good alternative for long sleeve shirt. I use it in warmer weather days. I appreciate its breathability as it is great for running. The wind and rain blocking powers are weak. I normally wear size M but got a L for this to wear a short sleeve tshirt within. The material is quite thin, getting one size larger decreases the chance of ripping it while taking it off. It doesn't have UV protection rating, but I still use it so that the sun doesn't directly touch my skin. I might purchase the hoodie version to use in a buggy terrain, when it is on sale.
I tried to use this piece in fall and winter in NYC, but these were too thin to block the chill.