I saw in another thread that most people would be comfortable adding thin harness covers to the Complete Air, and I would like to do so. The straps are leaving red marks on my son and sometimes upsetting him. But can anyone recommend a specific one, and maybe where to find some? The only one I saw at Target was a JJ Cole reversible one, which I don't think would be described as thin - well, also some huge ones that were shaped like animals, but anyway... Any recommendations? Thanks!