The Feathered Friends Hyperion is a very light down jacket from a company that has proven its quality when it comes to down. However, ordering it is not very convenient, since it is not available from major retailers, and only directly from the small manufacturer in Seattle (often custom-made, involving long delays in delivery). Since it the Hyperion can be incredibly difficult to purchase, consider the Editors' Choice rated jacket, $339, which is the Mountain Hardwear Hooded Ghost Whisperer.
But, if you can get past the idea of ordering a custom-made jacket, you won't be disappointed. The Hyperion does not come with a hood, which is unfortunate, but built into its 9.4oz is a huge amount (5oz) of lofty 850+ fill down, making it a slightly thicker, loftier, and arguably warmer jacket that the other sub-ten ounce jackets.
If you need something soon consider our Best Buy Award winning Rab Neutrino Endurance which is widely available from major online retailers.