Calvin Klein Underwear. 3 Pack. The underwear is a classic design and cut from a soft cotton with a stretch for comfort, Medium rise waistband, Logo branded elasticated waist. Fits true to size, 95% cotton, 5% elastane, Machine washable. Calvin Klein is an American premium fashion house which produces high end fashionable menswear including Jeans, Underwear, T-Shirts, Sweatshirts, Joggers and Shorts. Calvin Klein is a famous underwear brand which has the iconic CK brand logo.