I was wanting something to cover my loose skinned arms this summer and these fit perfectly for that. I wear them under my uniform top. They are lightweight enough to layer in the summer (In Washington that is). Will order more. For sizing tip, I wear a womens extra large. However in this brand I recommend ordering up. I ordered the 3X. I knew to do this because I have been wearing their long sleeved shirts for several yr. They are my favorite shirts when it comes to layering or wearing under my uniforms.