The newly redesigned Carbon Soft model will be replacing the 151 model. We know the words Carbon and Soft aren't typically found in the same sentence, without the word "not" being between them, but we really liked our Carbon Lite saddle, so we wanted to take just a little of the edge off of it. We researched various cover materials and found one that only added 20 grams of weight, while still adding significant cushioning for the shape of this saddle. The Carbon Soft retains the same shape as it’s lightweight brother but gives a measurable increase in eliminating any “hotspots” across the saddle. It is 151mm wide and has a Classic European shape, made for thinner riders that can use an aggressive bar drop to get all that speed. This seat also uses the 7x9mm rails for improved durability and comes with the longer front edge contours, so your cycling shorts do not get cut while riding this saddle. The Carbon Soft also features an improved relief channel in the nose to increase nerve pressure relief, and that alone makes this a standout lightweight saddle.