Three pillars in the down range, each focused on a different end use. Durability...Phantom , Stretch... Super DS , Lightweight...ie Ghost Whisperer UL which is an extremely lightweight jacket featuring 1000 fp fill , and weighs only 189g in mens medium but without sacrificing key features. An amazing 5 denier fabric New iteration of the Super DS Climb still includes a mix of synthetic and down fill. Slightly wider baffles, for strength and includes the stretch of the original. Designed to be worn under a harness for cool weather crags. All down is traceable via the Track My Down website, the people who came up with the RDS rating. You can look into the precise batch inside your jacket in amazing detail.