The best mid-layers offer supreme warmth-to-weight ratio and are able to pack down as small as possible, and the Beyond Medals Packable Down Jacket ticks both of those boxes. Tech enough to wear on any winter mission in the mountains, but casual enough that you can wear it cruising the streets back home. Down in the ultimate insulator, it works by trapping heat between the feathers but is still able to be super lightweight and compressable. The outer is made with 50% Polyamide, 50% Recycled Polyamide and the insulation is made up of 90% down, 10% feather (RDS-Down).