The S1-L is a true classic summer-weight jersey. We had to do some serious research and testing before we put this beauty into work.  We tested several lightweight fabrics in the field for over a year before we settled on this one.  To be honest it was an easy choice. The secret is in the yarns.  The mill calls them cooling yarns. We call them awesome. UV protection, superior wicking and drying abilities, and a natural coolness to the touch when things heat up. The fabric is also super-luxe feeling next to skin and holds up well with care. This one is a straight winner in our book. We've also updated the silhouette of our classic riding jersey body to have set-in sleeves, 5 total pockets (3 rear and 2 side-seam) a lower collar, longer sleeve length, a full-length inside zipper placket, and a slimming fit that will make you look better no where you ride. Year after year we have been asked for a true lightweight summer jersey to beat the heat. Here it is: The S1-L Riding Jersey.