Tilt adjustable seat post while riding. It lowers or elevates the tip of the seat while riding without dismounting of the bike. When approaching a climb you can lower the tip down to compensate for the incline. If you ride on even steeper climbs you can tilt the tip down even more so you always seat on a relatively HORIZONTAL seat. It helps especially with steeper climbs because this is the time when you spend the most energy and you want to have the most comfortable seating position. Seating on HORIZONTAL seat is always better than seating on a seat that is tipped backwards 10 - 15 - 20 degrees. It helps a lot also with numbness in your crotch as well. This is my first prototype and I have been riding it for year and a half without reliability issues. Currently working on a second prototype which should be cheaper and faster to manufacture. Cheers.