Streamline Mid Waterproof Composite Toe Work Boot. Performance-driven but with the perks of athletic inspired design, this style is flexible, lightweight and comfortable. It's casual enough to wear outside of work. For guys who need a work boot, but want anything but. ASTM F2413-11. Nylon Mesh with Direct Inject PU. Nylon Mesh Lining. Open Cell PU Foam Sock Liner. Dual Density EVA Midsole. Strobel/Cement Construction.