Step into each day in a comfortable, signature Calvin Klein style with these CK signature trunks. Featuring a classic, understated design, with an elasticated waistband and cotton comfort, this is the ultimate essential underwear men will love to wear everyday. Designed with everyday cotton comfort in mind, these trunks make getting dressed a breeze. Be confident that you will feel comfortable and cool all day long with these mens underpants. 95 Percent Cotton, 5 Percent Elastane. Machine Wash. Fastening: Pull On. Stretch.