Calvin Klein Underwear. 3 Pack. Featuring a front box logo design, Elasticated waistband with CK branding, Medium rise, 74% cotton, 21% recycled 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.