Calvin Klein Boys Black 2 Pack Boxer Shorts in Size 11 - 12 Years, Sports Direct. Calvin Klein 2 Pack Boxer Shorts Made from a soft Cotton construction with block colour throughout, these essential trunks from Calvin Klein have been designed with a simple aesthetic, styling an elasticated waistband for maximum comfort and a secure all day fit. The boxers are complete with signature CK branding embroidered around the waist.Looking for alternatives to stores like JD Sports, eBay, SHEIN, ASOS, Next, Best Choice UK, Very, Decathlon UK, Argos, schuh, Temu, BuyBetter, or Nike Official? Discover our unique selection.