Sweat proof undershirts were cooler and more comfortable. They quickly caught on with the peoples and became known as "T" shirts. It's obviously that to enable a daily change with sweat proof undershirts is the height of hygienic sophistication. Sweat proof undershirts supplied here are cut to cling to the body. Much more information about sweat proof undershirts can be found online here in sweatproofunderwear.com.