In the spirit of keeping things "Thin" and light I've skipped fendering and invested in a comfortable seat plus LCD display - more functionality and fun in my view - I agree the Sondors packaging is first class.
Planet Bike offers very good and good looking fenders for 700c wheeled bikes. The following are for bikes that don't have mounting bosses, but the same style are available for bikes that do have bosses (I wasn't sure if the Thin has front and back).
(Link Removed - No Longer Exists)
Very minimalist, will keep the stripe off your back and water out of your face. You can also get full fenders as well. I see Planet Bike fenders at just about every bike shop I go to, should you want to see before you buy. That way you could get in person advice on what would fit.