Huh, don't know what kind of dryers those of you who don't shrink them are using. Yes, they shrink a good 5% (unlike Smartwool and Driza-Bone which both seemed to escape my dryer the same size they went in). No crap, an XL will become an L and and L, well, tighter. I have both sizes and the XL's were too big, but after a drying they're a good T-shirt size for my 5'10" 170lb body. The L's are a decent baselayer fit with a bit of room around the midsection after drying.

Yikes perhaps you've been lucky but I would not put wool in the dryer. At least not the thinner weaves of this style. now if you're trying to shrink it, it's possible to do so (I've done it with an Icebreaker piece that got a bit too big) but micro-manage the process! Short intervals in the dryer. Last thing you want is for the width to stay unchanged but have it completely shrink length wise or some other unfortunate occurance.

I have had mine since June and it has not shrunk in the dryer.