Here's a pix of the seat covers compared, you can see that the Thor has much more area to push on , so more comfy for the rider. The front hump is what keeps the rider from sliding down, the stock seat has no hump per say so I was constantly pushing myself up. The front hump has't caused any problems for me. If you order a Thor make some measurements and go with that data, don't get a seat " one size larger". The Carrier seat in medium fits me. I also ordered the comfy version (3cm thick) of the ventist pad. I noted also that the Thor seat is less weight than the stock seat, but the ventist pad weight is significiently more that the stock pad weight.