I'm 5'5" 126lb. and got a size S. It fits perfectly and I love it! The bottom hits right about at the leg opening of my leo. It stretches a little and holds it's shape. I gave it a 4 in durability as there is already a hole in one sleeve near the thumb hole where the fabric has ripped. I have small hands and tiny wrists, and never wear jewelry. It could just be the fabric. The fabric is lightweight and not bulky feeling or looking. It keeps me warm without overheating.