Calvin Klein CK Solid Color Three-Pack Boxed Underwear. Calvin Klein CK Solid Color Underwear, available in a box of three. Boutique packaging. The underwear is made from pure cotton material, offering an excellent hand feel. It does not pill or lose shape, and has great breathability and moisture-wicking properties. It is snug and skin-friendly. The waistband features an embroidered CK logo design. The elastic waistband is durable and does not easily loosen. Comfortable to wear. Available sizes: L, XL, XXL.