What about using alcantara to upholster something
Aesthetically something different than leather.
How about a nice moquette fabric. Or an outdoor canvas used on garden furniture. Plenty of heavy use seat materials out there and most upholstery companies would be able to pad out a seat to your desired comfort level.
@Ramsaye started
London Fixed Gear and Single-Speed is a community of fixed gear and single-speed cyclists.
Aesthetically something different than leather.