3XL Knit Boxers, 100% cotton boxers (heather grey is 85% cotton 15% rayon). Big men's size knit button fly boxer short. Buy 3 or more and save $, mix and match!! Black, Navy or Heather grey. 3XL fits up to 48-50" waist (120 to 128 cm) Big men's boxer. Also known as cotton jersey 3X. The leg openings are approximately 20" across when flat, which would be a 40" circumference at the opening. Generally considered a full cut by most.