The HighLite is the lighter summer mummy. Western Mountaineering rates it at 35 F / 2 C and lists a weight of 16 ounces, with 850+ fill power down.
The page lists a price range of $470 to $495 and says the bag is made in the USA.
Shortlist reason: Western Mountaineering lists 35 F / 2 C, 16 ounces, and 850+ fill power down.