I wear plastic orthotics and am constantly having to replace the Dr. Schol's and lesser equivalents because they don't stand up to the level of activity with the orthotics. I purchased a pair of Merrell hiking boots 6 years ago, which are still my favorite shoes, and just recently needed to replace the in-soles on them. Alternatives just didn't cut it. I finally went to the Merrell website to see if they had replacement in-soles, which they did. I bought one pair initially to verify the quality and was pleased that they were the same high quality that came with my boots. I've since purchased two additional pairs, one for my dress shoes and another 'just in case'. Great product!