Bontrager originally designed the inForm Nebula Plus WSD saddles for the more upright riding position associated with hybrid and fitness bikes. But we found that anyone who rides upright, be they a mountain biker or a roadie on the new breed of more upright road bikes benefit from the Nebula's design. The women's-specific recessed area relieves pressure on soft tissue. They feature Flex Form Technology, a rubber elastomer that allows the saddle to rotate subtly from side to side to accommodate the natural movement of your pelvis while pedaling. They also come in 3 different custom-tuned widths that give you superior skeletal support for the ultimate in comfort.