Bison Ultralight Liner JacketDetails Trust us, its warmer than it looks. The secret to this surprisingly warm liner jacket is our signature BisonShield insulation, made with salvaged bison wool that we intercept from the waste stream. Equipped with a weather resistant recycled polyester shell that keeps you comfortable while keeping old plastic out of landfills. Wear it alone or button it into the Recycled Wool Blend Guide Coat for extra insulation. Features: buttons into the