I have a pair in size small - I ordered before the made x-smalls.
When I put them on, they seem pretty big, but when I am down in aero I think they may be just right, if that makes sense.
I'm 5'5" and around 125.
There are a few pictures of me wearing them here:
http://kcwoodhead.blogspot.com/.../04/bike-and-t2.html I'd be interested to see how the XS fits, and if I'd like them any better, but oh well. Also I have not worn then since IMAZ in april 08 - they were awesome there and definitely served a purpose, but I live in Houston where our humidity is through the roof, and so far haven't felt like wearing them on a hot sticky day. Hot and dry, they were awesome. I just did CDA (not too many awfully hot rides for that) and am about to start training for IMFL, so may have a few hot rides there that I may pull them back out for.
They did a great job of blocking the sun too - I did not put sunscreen on underneath and did not get any sun at all. There was one side in teh back where they flapped up though and I got a bad burn there!
ok sorry that was long!
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Kathleen
http://kcwoodhead.blogspot.com/