David Archy Men's 3 Pack Underwear Ultra Soft Bamboo Rayon Basic Boxer Briefs 95% Bamboo Rayon / 5% Spandex ABOUT THE TAG: Fiber extracted from plants is called Rayon which is the terminology of fiber species. Bamboo rayon fiber, as one of the subdivision of Rayon, refers in particular to fiber extracted from bamboo, which just is one kind of rayon. However, we are requested to strictly indicate the content of fiber species, like Cellulose, Rayon, Cotton...on the care labels. Note: Two versions for your flexible choice: one with functional fly; the other no fly. Please kindly check the color name and pictures before ordering. Soft Fabric: Bamboo Rayon here is a kind of Rayon fiber extracted from natural materials-bamboo. It is featured with good air permeability, light weight, ultra soft and odor-resistant. Stay-put Waistband: With soft touch and good elasticity, will not roll down or leave marks. 3D Pouch: Have more room for men's private parts, no squeeze any more. No riding up: 6.5 inches leg length can avoid riding up for daily wearing no matter sitting in the office, taking a walk or jogging.