Detailed with a funnel shearling collar, this lightly cropped puffer jacket from Theory features a featherweight shell composed of recycled nylon. Detailed with a funnel shearling collar, this lightly cropped puffer jacket from Theory features a featherweight shell composed of recycled nylon. Established in 1997, New York-based Theory creates cool, expertly tailored clothing from the finest materials designed to inspire how you feel, work, and live.