The seat of my recumbent has a taut 2D mesh back which is quite good at letting sweat through. That can't be said about the ordinary foam pad supporting the ass. There are special "foam" pads which are really more of a 3D mesh and which were designed especially for recumbent seats:
I only know of one manufacturer of such products, www.ventisit.nl.
Does anyone have experience with a pad like that? When you compare sitting on an ordinary foam pad, sitting on a Ventisit and sliding up on the seat so your ass doesn't touch the seat, where approximately is the Ventisit (or any other similar product you know) on this scale?