Perfect as undershirts in winter time! 2T size fits my 2yo perfectly (31lb and about 35 tall). No worries about him growing out of them anytime soon. (Label indicates 2T-3T, and Id agree with this sizing).  Ive washed them several times with no issues in shrinking or distortion (as others have mentioned). I do HANG DRY however, as I do all his clothes to avoid shrinking.