There is one significant con of the socks made from natural materials. We are not taking to account scratching caused by the wool, because it’s more of a personal preference (some people like it, others don’t). So the con is the wool is rubbing off. Different materials, including synthetic materials, can be used to reinforce heels and toes. But this doesn’t work for me as I assure that my product is 100% natural. Keeping my product natural and ecofriendly, I use a special reinforcement technique for those parts of the socks which rub off quickly due to foot anatomy.