I am usually very partial to 100% cotton undergarments. I have tried many different poly athletic style undergarments, but they only trap heat and make me hot. I saw the great reviews for the Penn boxers, and thought I would give poly another try. I am glad I did. The material is very lightweight and breathable. They fit very comfortably and seem to be of good quality. I am just starting to wear them and have not experienced the longevity of the product. I would recommend them to anyone that likes boxer briefs, as a product to try.