Superior dense layer of treated natural felt absorbs perspiration combined with a thick cushion of resilient foam. It can be easily trimmed with scissors for custom fitting. The felt is made of 30% wool & 70% rayon and the foam is made of latex and is 1/4 inch thick (6mm). Available in Adult sizes 6 to 13 in men’s sizing. For women’s sizes, we recommend to order two sizes down, if you wear a size 9 in US women’s, your best fit would be a size 7 US men’s. Adjustments can be made to the insole by easily be cutting down to size using a sharp knife and short, frequent strokes.