evo.com | Obermeyer Synthetic Jackets > Six hundred fill power duck down means the Obermeyer Cold Mega Jacket brings serious warmth without the weight of a sleeping bag on your shoulders. A 100% nylon shell rated 20k for waterproofing and breathability handles the wet stuff, so this is the jacket for the coldest lift rides and the storm days everyone else bails on. 20D Plain Weave Nylon 100% Nylon 20K Waterproof / 20K Breathability Center Back Length 29.5" Regular Fit 600 Fill Power Duck Down | Obermeyer Cold Mega Jacket Men's 2027 - Medium Yellow | Nylon