The warmest shirt in your cold-weather kit, the women's Burton Kiley Insulator is cut from a comfy cotton/nylon blend coupled with the fire-stoking performance of responsibly-sourced 650 fill down. Living Lining tech puts you on the pedestal â adapting to ups and downs in activity for instinctive all-day comfort. Additional details include a ribbed collar, microfleece-lined hand-warmer pockets, single snap closure, and timeless hourglass patterning.