With over a century of history in hand-stretched Italian saddles, it can be easy to assume Selle Italia is a little oldschool, but you would be wrong. While the brand's heritage may go back a good while, its drive for progress has never halted, and the SLR Kit Carbonio Boost Saddle drives the point home. It builds from the coveted SLR saddle, with its extensive research in saddle design finding the best ways to tweak shape for comfort on race days and tours alike. They introduce a unique rear frame that innovates on traditional ideas to allow independent flex of the left and right side of the saddle, so you can ride with more effective support on the alernating motions of your hips while you pedal, resulting in improved overall comfort, without faltering on stability when you're hammering on the pedals going for the breakaway. Selle then pairs this technology with a central recessed channel designed to relieve pressure to the perineum while you ride, giving your most sensitive anatomy a break from the impacts of cobbles and rough roads. Selle Italia crafts most of their saddles within a scale in its lineup, and the SLR Kit Carbonio Boost lands near the top, just a notch behind the featherweight Tekno verson, scaling in at just 12-grams heavier -- hardly a noticeable difference. It features a more compact shape than the standard SLR, with a shorter nose that stands out against the competition, and a construction that's optimized for racing. By using CarboKeramic rails and a shell comprised of a carbon fiber/nylon blend, Selle Italia is still able to achieve an impressive weight, but without any durability concerns or a rider weight limit.