Madison's Flux Deluxe shorts are made from a lightweight four-way stretch material, which is very comfortable on the bike. The knee-length cut is great too.
There are zippered vents on the legs to help promote ventilation, plus zippered hand pockets which are ideal for loose change and small items. An internal waist cinch helps you fine-tune the fit and a stretch panel on the rear keeps the shorts comfortable when you're in the saddle.
The included liner isn't the best out there, but does the job and is removable so it can be cleaned easily. Despite being thin shorts, they're surprisingly rugged and when you get soaked they dry out fast. They're a bit expensive though.