Really, really disappointed in this purchase. I followed the info I found on the site and bought 18" inserts for my 16" pillow covers and they feel like hard, dense foam. There's nothing soft or cushy or comfortable about them. They're bouncy and give a ton of pushback. They're actually uncomfortable to lean against now. I wish I would have bought the 16" size or some other product entirely. Beware, if you don't like foam pillows, don't buy these. I miss my old lumpy pillow inserts.