Am fond of the Mountain Hardware Ghost Whisperer line of down gear. The men's down jacket is about 8 ounces w/ 800ci, moisture-resistant fill and 7D fabric. Do NOT scrape against ragged granite.

My Trail, formerly GoLite, has more affordable yet still high-quality options. To be honest, there are infinitely more options than ten, fifteen years ago when we had Western Mountaineering, Feathered Friends and a scant few others to choose from. Good down used to be very hard to source and the super-light fabrics simply didn't exist. At some point, the shell becomes the main weight, not the fill.