Calvin Klein has been creating classic men's underwear for over 25 years. Calvin Klein underwear is designed to fit every aspect of a man's life. Calvin Klein Tech-Active and Tech Cool are designed with stretch, support, and athletic innovations for men with an active lifestyle. Calvin Klein 365, Calvin Klein Body, and Calvin Klein Flex Fit were created to be comfortable and stylish for all day every day wear. Calvin Klein underwear has continued their history of innovation with Calvin Klein Steel collection which features super soft fabrics and a one of a kind silver logo waistband. Calvin Klein is a classic collection of men's underwear for every occasion.