For a pair of boxers that go down to your knees, the Malebasics Men's Base Layer Performance Sport 9 Inches Short Boxer Brief might be the best choice by far. It comes in this large size and in this black color that is contrasted by the white seams that are flat to prevent nasty chafing. You also get a contrast of white with the wide waistband that bears the brand name in large black letters. You get a sporty look that works for any kind of athletic activity but not only does it look good you also get a boost in performance because of its moisture wicking properties.
Coverage is all over the place and the front pouch is very supportive which keeps your thang from going all over the place when the action is hardcore and it is also comfortable where it lies.
Made from a mix of 78% nylon and 22% lycra.