Speedo USA Unisex Core Solid Brief - PowerFLEX Performance : 70800: Constructed from Xtra Life LYCRAÃÂ® fiber that: Is engineered to have 5-10 times more durability than ordinary spandex fabrics. Provides resistance to suntan lotions, skin oils and chlorine better than conventional fabrics. Helps resist sagging and bagging, keeping swimwear fitting newer longer. 9 Thread Flatlock Technology for a better fit. Brief offers less coverage and maximum freedom of movement. Low drag profile. Non-slip drawcord at waist. Fully front lined. Classic quality and performance from our Speedo Core line. Fabric: 74% Nylon / 26% Xtra Life LYCRAÃÂ® fiber.