Shop boys' underwear in red, blue, green, yellow, gray, and many more interesting colors. Calvin Klein Inc. is an American fashion brand that was set up in 1968. It was established by the popular fashion designer Calvin Klien. Lifestyle and home accessories, watches, fragrances, and more. Many products are available in only one color and that is black. Choose your Calvin Klein Black Underwear for boys made from wide varieties of material such as Cotton, Blend and Microfiber. Each material provides different look and feel of Calvin Klein Boys Underwear.