Our Fleece Lined Jac-Shirt bolsters a trusted Filson staple with insulation for colder weather. it's built with sturdy 10-oz. cotton canvas for years of reliable service and lined with fleece in the body and polyfill in the arms. Garment-washed for a well-worn feel from the first wearing. Pleated shoulders for range of motion. Fleece-lined handwarmer pockets.