on 28 August 2014
I'm an XS / UK size 8 and the jacket I received (XS) was true to size. It's a great jacket - very thin / light-weight. The cuffs have an elastic, which keeps it closer to the wrist / prevents the sleeves from riding up. There's a small piece of reflective tape at the back which is good for safety if you're running when it's dark.
At 55% off, it was a great bargain and if there was another XS, I would've bought a second one.