Lightest and Warmest
i chose the mountain hardwear phantom over the mountain hardwear sub zero for two reasons.
1. it's warmer with 800 fill vs. 650 for the sub zero.
2. it's lighter at 15oz (440g) vs. the sub zero 1lb 11oz (765g).
i am 5'10 with 30 inch waist and i even went a step further and went for a size small. it's perfect, but any smaller and it would be too small. it's light and super warm. i like the shortness of it in case i need to wear a harness however some might feel it's too short. it packs down into a nice little package for packing on the skin up. AND the fleece lined pockets are a very nice supprise luxury for a superlight jacket.