The fabric was 100% cotton and in the years he wore them, never a hole anywhere. Hanna's customer service is wonderful btw.
My ds, needed all cotton and they are expensive...I kept around 3-5 pairs in his size and washed them after every use. Week after week, they held up to him and the washer/dryer and never looked old enough to toss or donate. We always passed them down to the cousin. Most sizes because of the cuffs, would work for around two years. That made them worth the money to me.