I've talked to a rep at Marmot and the new Helium has a passive collar which is an extension of the draft tube according to him. One reason I never got the Helium was the Half Zip. Solved. Another Reason was lack of draft collar. Partly solved.I might end up getting it if the weight is not outrageously over the 31oz claimed by Marmot (which will undoubtedly be higher)