The Selle Italia SLR series are some of the best-known saddles on the market. The SLR Flow takes comfort to a new level with the inclusion of a cutout and leather cover. The Flow is designed with the same 131mm width and 275mm length as the SLR Tekno. The width is ideal for riders with average width sit bones, while the length allows you to move fore and aft depending on what terrain you are riding. The biggest noticeable difference is the cutout which helps to relieve pressure on the perineal area and soft tissue. As a result, that pressure is directed to your sit bones (ischial tuberosity), which are far more adept at supporting your body weight. Additionally, they're able to do so without causing numbness during long rides. This principle is further supported by the wide cut out, as it removes pressure from the pudendal nerve. Essentially, this is a nerve that runs from around the third vertebrae, all the way down towards your foot. And when compressed at the perineum region, it is one of the major contributors to numbness. So, by relieving the very threat of pressure, your blood flow remains consistent, eliminating numbness. To put it into perspective, the cutout is slightly narrower than the one found on the SLR Super Flow. The SLR Flow features slightly thicker padding that the rest of the SLR line. It's thicker than the Carbonio and yet thinner than the Flite or SLS. Leather covers the padding and it rests upon a nylon/carbon composite shell and Vanox rails. While slightly heavier than carbon rails, they're strong and durable enough for off-road use. The Selle Italia SLR Flow is available in One size and in the colors White and Black.