Purposefully looked for paper or cotton. It’s a great product and well priced. Listen ladies if you have heels, don’t waste your money! My ears are just small so they kinda reject them from fitting seamlessly. Thet is nice My other issue falls on manufacture, the screws and anchors seem to be inadequate. 8 hours, so I left it for 3 and it seemed fully charged but again, there is no visual indicator. Perfect length, perfect thickness. I’ve owned Oakley sandals and flip flops for years. Love my Crocs!