Amber G.wrote a review of Arc'teryx Rho AR Top - Women's on November 25, 2009
At 5'3" and 110 lbs I got the small. It is a tad large, but I am able to layer a bit under it. It is stretchy and has a fleecy interior. Note that is does have some piling problems. Great for working out (whatever that may be) in cold weather.