So a few months back i got an easyseat from hobson seats, i love how it feels but there is a problem.
Ever since i installed it the saddle has a tendency to move back through out a ride, no more than 40 minutes and my saddle is in a very uncomfortable position. It only moves back, no tilting. i usally have to get off, adjust it and get back on.
Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
What kind of seatpost and clamp do you have?
If you have a straight seatpost and a separate clamp, make sure the size of the clamp matches the clamping area of your seatpost. If they don't go to an LBS and try to find a replacement that does. Then seriously snug that puppy down.