The Helium Down Plus Size Hoodie takes durable lightweight warmth to a new level. Its secret sauce is Pertex Quantum with Diamond Fuse Technology, which protects the 800+ fill down with an exceptionally durable and abrasion-resistant shell without adding weight. The Helium Down Hoodie even uses an exclusive waterproof version of Pertex Shield with Diamond Fuse fabric on the hood and shoulders for added weather invincibility.