I read the reviews & decided to take my chances & I'm glad I did. It is made from such a wonderful soft technical fabric. I know SportHill has more generously sized it's products so I ordered a S again even though I've ordered M in the past. It fits perfectly as a single layer or underneath another garment (I ordered the Echo Zip Top in a M because the S's were sold out). I am 5'3", 105 lbs. I really like this product and for once the sleeves aren't too long on me!