Warm Performance For Those Really Cold Days. Senja Down W Jacket Is Designed To Give Maximum Warmth At Lowest Possible Weight And Packing Volume. The Panels Are Stuffed With Certified Responsible Down In A Box-Wall Construction That Ensures That The Down'S Full Insulation Potential Is Utilized, And To Eliminate Cold Bridging. The Pertex Quantum® Material Is Windproof And Water Repellent. The High Protective Collar And Helmet Compatible Hood Gives Perfect Protection To Your Neck And Head. The Shoulder And Side Seams Are Staggered Backwards To Prevent Wear And Tear And Increase Comfort When Carrying A Backpack. Stuff Senja Down W Jacket Into Your Ski Touring Pack And Forget About Getting Cold.