The all new Helium Down Collection takes durable lightweight warmth to an entirely 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 Hooded Jacket also uses an exclusive waterproof version of Pertex Shield with Diamond Fuse fabric on hood and shoulders for added weather invincibility.