This versatile pullover offers wind and rain resistance, and packs into its own stylish fanny-pack-style kangaroo pocket. WindWall WindWall fabric is a wind-resistant fleece. WindWall utilizes a unique fabric-bonding process that allows a limited degree of external air permeability (approximately 20 CFM), which drastically reduces the effects of windchill and enhances your warmth and comfort. WindWall 1 fabric has a mesh liner, while WindWall 2 fabric has a grid fleece liner for even greater insulation