This was purchased to use on a very firm twin size chair bed. It is in NO area 4" thick. I left it to air for 3 days, shaking it to fluff every few hours. Then I put it in the dryer for 20 minutes as suggested. It appears that every other row of baffles vertically was properly stuffed. It's hard to show in a photo with no contrast. I will not return it as it's needed for guests this weekend and is marginally better than nothing. In case you haven't figured it out, I would NOT buy it again.