BIKER BRIEF w. FLY - Iron Grey. Our seamless, 6-inch Blue Diamond Gradient Biker Brief is made from a plush and super-soft Lenzing Modal, cotton, and elastane blend. Providing the plush, gusset design you need to minimize ride & achieve total breathability. This soft and seamless biker brief provides 6 inches of ample coverage and support when and where you need it most. Non-binding waistband. Plush fit. Functional fly. Lessen ride and minimize chafe, you’ll maximize your mobility in high-performing, breathable biker briefs ‒ A total gem.