Going from a regular XS to a slim fit S, the shoulder and back area is a bit looser and not as tight around the forearms and wrist. The sleeves and sleeve openings are also a bit looser. I'm about 5'10", 150 and the regular XS is too tight around my back and forearms. The slim S is perfect around my shoulders and back, and the sleeves fit comfortably.
4/4/12 at 4:36pm