Cushion for tillet/composite seats?

[jimmylukeii]

Does anyone have a good source for pads?  The "race" seats are fantastic but get a bit old after several hours drives.

 

Anything removable for track days when maybe padding is not preferred?

 

Something like the following, but on this side of the pond:

 

https://www.sevensandclassics.com/online-shop/p/quilted-seat-pad

 

or 

 

https://caterhamparts.co.uk/race-seats/4399-seat-liner-padded-for-race-seats-pair.html

[wemtd]

Do you have the tillett suede pads? 
I find mine quite comfortable with them even on long drives.

[MV8]

Yoga mat cut to shape. Can also be covered and hemmed by your local upholstery shop.