The Patagonia Micro Puff Hoody is the best warmth for weight jacket ever made by Patagonia.
It is extremely light, water-resistant, and incredibly warm.
This jacket provides warmth while maintaining a weight of only 9 ounces. It is compressible, and keeps you warm even when it's wet due to synthetic down. The magic behind this jacket is in the revolutionary PlumaFill insulation and nylon ripstop Pertex Quantum shell with a DWR coating, which blocks rain and snow. Zippered handwarmer pockets, internal drop-in pockets, and a light and simple under-the-helmet hood finish off this jacket nicely. The left pocket doubles as a stuff sack with a reinforced carabiner clip-in loop. This is the ultimate jacket for the traveler or backpacker looking to cut weight but not comfort.