Cool Ties cause chaffing. My bf chose to suffer the heat for a couple months until he convinced himself he could live with chaffing. lol
If anyone wants to purchase some to check out the construction of an okay'd Cool Tie, or to gift them to anonymous deployed military, Soldiers Angels sells them.
Maybe the serging adds to the chaffing problem? It could just be a zero tolerance rule. It's easier to say "no serging" than "no serging on the outside." It could also be that serging on the inside does add to the chaffing problem.
I don't know. I'd ask my bf but he doesn't understand serging. Email them and ask sweetly for an answer.