Introducing the new SMC CoreMen, a highly comfortable saddle featuring a core and two-layer shell developed for comfort saddles! This mountain comfort saddle features a core that effectively absorbs shock and vibration from the road. It features chromoly hollow rails, a nylon composite shell, and comfort foam for enhanced comfort. Microfiber Comfort Foam BASF Infinergy Core Nylon Composite Shell Chromoly Hollow Rails Sizes: S/M: L277 x W148mm, M/L: L277 x W161mm Sit Bone Width: S/M: 90-120mm, M/L: 120-160mm Weight: S/M: 345g