The sleeping bags from Grüezi bag are a sleeping paradise for trekkers and summiteers. Discovered and tested by the magazine 'trekking', you can read the article for download as a .pdf file: Magazine trekking-Buyer's Guide-Issue No04-May 2019-Biopod DownWool Subzero-Page 50-53 Off into nature and enjoy a restful sleep in a Grüezi bag sleeping bag!