Some riders find the lightness and minimalist padding of the SLR agreeable, but they prefer "cut-out"-design saddles. The SLR Gel Flow is just that: It has the vital characteristics of the standard SLR, but it offers pressure relief in the form of a cut-out along the middle of the saddle. Just like the SLR, it has a 30% carbon composite shell for lightness, plus a full grain leather cover for longevity. But unlike the SLR it has a cut out surrounded by padding in differentiated thicknesses. Another point of distinction is the rails used on the SLR Gel Flow: Instead of the "Titanium Tube" rails of the SLR, the Gel Flow version has Telaio Vanox rails -- a lightweight Vanadium-Titanium alloy. It tips the scales at 215g. Just like the SLR, it measures 131mm wide and 275mm long. Available in Black, Blue, Red, White, and Yellow.