Castelli's Reflex Shoe Covers don't let your feet claim exemption from reflective duties on rides in low-light or inclement conditions. The booties' wind- and waterproof material is reflective and conspires with the sealed seams and neoprene cuffs to maintain an impervious barrier against the elements. The fabric is also breathable to prevent clammy -- then icy -- feet, and the cordura sole protects the equally valuable carbon skin of your shoes' outsoles.