If you're looking to just keep your seat and windshield dry or protected then the Nelson Rigg CAS-375 Can-Am Spyder Half Cover will do the job. Constructed of durable Tri-Max nylon with a soft backing, this waterproof cover will keep your seat and windshield dry.
Made from a top quality "Tri-Max®" TM nylon with soft backing
All seams are electronically heat sealed making the cover 100% waterproof
Snug elastic hem
Packed into its own attractive matching carry all
5 year "No Hassle" warranty
Available in black