Calvin Klein Cotton Stretch 3-Pack Men's Boxer Briefs in Black A value three pack of cotton stretch Boxer Brief. Pouch front. Calvin Klein Signature logo waistband 95% Cotton / 5% Elastane MPN: nb1770a-001 Our Collection at Boxers and Briefs contain only the highest quality Calvin Klein Mens Underwear.  One of the most popular ranges is the CK 3 Pack Cotton Stretch Boxer Brief collection. Within this range we have a Black, Calvin Klein Cotton Stretch 3 Pack Boxer Brief,  which is available in multiple sizes ranging from X-Small (24-26") Small (28-30") Medium (32-34") Large (36-38") & Extra Large (40-42").