Men’s briefs Men's underwear made from nylon / elastane Machine wash Imported Tagless Calvin Klein underwear style U7070F Experience the latest addition to Calvin Klein's popular Pro Stretch line of men's underwear ... the Pro Stretch Reflex Briefs. Equipped with the exclusive Calvin Klein COOLMAX waistband for maximum comfort, these microfiber briefs are made for guys who demand nothing but the best in their top drawer. Offering a low-rise, athletic fit, the Calvin Klein Pro Stretch Reflex men's briefs feature contrasting seams on the pouch for a sexier silhouette, a 2-ply, seamed contour pouch without fly and an embossed logo on the waistband. The lightweight, breathable microfiber wicks moisture to keep you cool and dry.