Silky soft fabric which seems to regulate temperature really well. A true sports fabric. Wore it working my horse on one of those funny early Spring days which are either too cold or too warm and it kept me comfortable. I got it in pink and love how feminine it looks on. Another plus is that it really repels dirt which is a big plus for me around the barn. I ordered up a size per customer reviews and I like the fit. Roomy without being baggy.