The Vango Ultralite Pro 200 Sleeping Bag has been designed using a combination of advanced technologies to keep any adventurer insulated whatever the conditions. Made for year-round explorers looking for an ultra-small pack size and weight, yet needing high thermal capacity from their bag, it comes with a Trilateral Construction, 4T insulation and a Thermal Embrace System, which when working together offers the ultimate trekking pack. Technical Information Trilateral Construction – An independently floating layer of insulation is not compressed by stitching, which reduces cold spots and increases core temperature. Polair® Active Shell – 20D Nylon fabric for a warm and compressible fabric which is water and tear resistant. 4T synthetic insulation – Innovative synthetic insulation fibre that improves warmth to weight ratio by trapping air in its patented channel structure. Thermal Embrace System – Elasticated thread sewn into the inner fabric makes the sleeping bag gently conform close to the body thus reduces cold spots and increases loft of insulation. 3D insulated zip baffle – Minimises heat loss through the zip. The 3D shape allows the filling to loft and provide insulation. Full Length Two-Way Auto-Lock Zip with Zip Guard – Used to seal in warmth or provide ventilation and can be used from inside the bag. Anti-catch piping also helps to prevent the zip from snagging on the lining. Omega Shaping – Engineered to position zips and seams in the lower section of the bag. Ergonomically shaped to fit around head and shoulders for improved heat retention.