Modal-Viscose blend is 3x softer than cotton Breathable material to eliminate sweat Shrink resistant material Contour pouch with no fly for max support Comfy, durable flatlock stitch to eliminate seams Good Luck Undies are the ultimate everyday essential. With breathable modal-viscose blend fabric and a comfortable fit, there's no pinching, sagging, or adjusting. Just simple underwear that will leave you feeling (and looking) good.