Mountain Hardwear Micro Ratio™ Down Jacket Grey XlA sleek, low profile down jacket that repels water, it's made with slim baffles to retain maximum heat, and boasts an outstanding warmth to weight ratio. The Micro Ratio Down Jacket is fortified with Q. Shield DOWN 650 fill insulation, which retains critical loft and warmth even when wet. Despite its big jacket warmth, this compressible wonder is designed so efficiently that it stows away in its own pocket for easy packing.