Hi all, there may be a better spot for this but I frequent this forum and there are a lot of Wool fans here so I thought I'd ask here.

I have some wool shirts (http://www.rivbike.com/products/list...product=22-860) that I machine wash and dry with no more shrinkage than a cotton shirt. I regularly put them through the wash with no issues.

So at first I thought it was just that it's Merino. But then my wife accidentally put a Merino sweater through the wash and it shriveled up. So then I figured it was a combo of Merino and the fine knit of the shirt.

Recently I bought a merino sweater from the thrift shop that was too big for me. My plan was to run it through the wash and shrink it down (it says "dry clean only") then block it out to the right size. In the same load my wife accidentally washed another one of my merino sweaters (also labeled "dry clean only"). This time neither shrank! I also saw a sweater at a store (labeled "machine washable) the other day. What gives?