Look no further than the uncoated microfiber 'Fitness Gear' shorts with 4" inseams sold in Dick's Sporting Goods stores. Size medium, which is always in short supply, weighs about 3.7 ox. I don't think they sell the shorts on their website, only in the stores. The shorts have a liner, two side pockets, and an internal key pocket. I've used the same pair of shorts since 2004 and the thin microfiber material is plenty tough, cool in the summer, and warm in cool weather. Dick's seems to restock the shorts every month in the spring and summer, but they sell pretty fast and can be hard to find in the store. My supply will probably last for the next few decades.