SHEATH G6 Bamboo Men's Single Pouch Boxer Brief Black (Medium SHEATH 4.0 Bamboo Trametes Men's Dual Pouch Boxer Brief SHEATH 4.0 Bamboo Men's Dual Pouch Boxer Brief SHEATH UNDERWEAR SHEATH 4.0 Bamboo Men's Dual Pouch Boxer Brief Black (XX Large SHEATH 4.0 Men's Dual Pouch Boxer Brief Ocean Wave (X Large SHEATH 4.0 Men's Dual Pouch Boxer Brief Ocean Wave (X Large. (Patent Pending) Our flagship product and most popular design to date, the SHEATH 4. 0 Boxer Brief seamlessly blends comfort and function with its innovative dual pouch design, providing both a flattering fit and luxurious separation of the male anatomy. A portion of proceeds supports the Heroic Hearts Project explore the full Trametes Collection here.