Because we have no way of knowing how each of our customers wears our socks, we are unable to offer a wear-and-tear guarantee. Our socks are classified as casual dress socks and are not meant to be worn for activities such as hiking, running, or physically demanding jobs (the kind you’d wear work boots for). For these activities we recommend wearing a technical or sport sock that is made to withstand the demands of that type of activity. We pride ourselves on knowing we have make a high quality product that is built to last during normal use. Excessive friction on rough surfaces such as concrete or carpet can cause the cotton to fuzz and/or pull and is considered a normal event with socks that have a high cotton content like ours.