Zappos.com is proud to offer the Calvin Klein Underwear - Pro Stretch Reflex Boxer Brief (Lava) - Apparel: Go to work, the gym, here, there, and everywhere in cool comfort courtesy of Calvin Klein™ Pro Stretch Reflex underwear. ; Silky, fast-dry microfiber fabric and Coolmax® waistband offer excellent moisture management. ; Classic boxer brief silhouette. ; Athletic fit. ; Iridescent waistband boasts the red Pro Stretch logo. ; Seamed pouch. ; Contrast piping borders the pouch. ; Tagless. ; 90% nylon, 10% spandex. ; Machine wash cold, tumble dry low. ; Imported. ; If you're not fully satisfied with your purchase, you are welcome to return any unworn and unwashed items with tags intact and original packaging included.