The Sea To Summit Voyager IV Sleeping Bag is a top-quality synthetic bag for relentlessly wet environments . The Voyagers THERMOLITE insulation will still perform and trap warmth if damp or wet . The Voyager is cut to a relaxed mummy shape , with a large hood, broad shoulders, and a large chest to provide you with a comfortable sleeping space while maintaining thermal efficiency . An oversized neck-collar and hood-seal keeps drafts out , minimising heat loss from around your face. This sleeping bag features an anatomical foot box , shaped to fit the natural position of your feet when lying flat and relaxed. Best of all, the Voyager can be converted from a traditional mummy bag to a duvet thanks to a full-length side and foot zip , offering you versatility even with a cold-weather sleeping bag. The Voyager implements an oversized zipper draft tube to prevent heat loss from this side zip. Soft and compressible THERMOLITE hollow fibre insulation is sewn into the Voyager using a proven two-layer offset shingle design , giving the Voyager an even two layers of insulation throughout the whole bag with no cold patches . With a 30D DWR nylon shell and soft, warm-to-touch 50D polyester pon