Made using super soft bamboo fabric and a blend of spandex for added stretch and flex. Chill Boys Bamboo Boxers and bamboo boxer briefs are the ultimate for soft relaxing comfort! The breathable bamboo fabric is naturally cool, soft and fights odors. In addition to being the most comfortable boxers, they are also eco-friendly! Bamboo is one of the fastest-growing plants on the planet so you can feel good about feeling good.