Three unique fabrics, each engineered for a specific purpose, differentiates our down from others. MIKROTEX nylon shell is woven extremely tight to provide durable down proofing with wind and water-resistance. Body front and top sleeve has an additional over-lay for extra protection against the elements. TUFFLEX softshell reinforced shoulders allows you to carry skis or equipment that would shred any ordinary down sweater. The responsibly sourced (non-force-fed/not ‘live-plucked’) 800-fill goose down provides a superior warmth-to-weight ratio. With thermal body mapping design, the larger baffles at front and back body provide core warmth. The thinner, sized-down baffles on the side body and sleeve provide a contoured fit and reduce bulk for improved layering.