25-or-so years ago, when I got back into cycling after almost 20 years out of the saddle, I found that my trusty old Fuji's hard leather saddle didn't like my then 40-pound-heavier self... So I got a suspension seatpost from Bike Warehouse/Nashbar (not sure when the name changed.) Mine is a 1" diameter 1" tall elastomer 'puck' in the middle of a knee-joint hinge -- works well to take the 'buzz' out of rough pavement but not enough that it changes seat angle much as it compresses. It must not have been received all that favorably, since I don't see that style offered anymore... But I like it!