Polyester feels comfortable and is indeed lightweight, good for the 45-60 degree days. Color matches picture. Quality is good, especially the zipper and the seams.

The 1 issue is it's slightly oversized. If you plan to wear heavy clothes or are above average in the stout/height category, that's fine, but the medium was too baggy/long for a thin person who wears medium and the right length but just barely too tight for a thin person who wears an XL.