Speed Defies Gravity! SDG has been making saddles since the early 90's and the Bel Air is still considered one of the best mountain bike saddles of all time. They were one of the first saddle makers to use Kevlar on their saddles that were more durable than the delicate leather that was coming on saddles out of Europe. They constantly push the envelope of saddle design and when they introduced the I-Beam composite rail they updated a design that has stayed the same for 100 years. The Composite I-Beam eliminates bent and popped rails while reducing weight. The 1 bolt seatpost makes installing and adjusting a 15 second affair. Plus it gives more than twice the fore/aft travel of any other seat. SOme of the top teams in the world ride SDG and I-Beam saddles and posts. Take a ride and you won't be sorry for choosing SDG.