i'm a newbie biker. for cold and wind this jacket is awesome. took it out today for 40 miles on a 58 degree 30 mph wind day and didn't feel a thing. zipped up at the neck for the cold spots. unzipped for the sunny warm spots. perfect. i'm 5' 4" 120 pounds and ordered the medium. it is a good fit and i think the small would have been too small. Gore rocks. can't wait to buy more of their gear.