The Rab Altus Vest is a lightweight synthetically insulated vest designed for high performance in damp environments. It utilises Cirrus insulation for excellent breathability and warmth to weight, whilst retaining its high performance when wet. It is contained in stitch through mini baffles making it ideal as a mid layer. The outer is packable Pertex Quantum and the arm holes are elasticated for a snug fit. The front zip is complete with an insulated baffle and chin guard and there are 2 hand warmer pockets, one of which doubles as a stuff sac.
Cirrus insulation combines the benefits of down with synthetic fill. It is in fact a synthetic insulation that unlike others has not been formed into a sheet. Instead it remains a loose water resistant down like fibre that expands to form a "cloud of warmth". It will deliver the same warmth for its weight as 600 fill power duck down. As well as lofting properties Cirrus is very compressible as well as robust. It's also very fast drying allowing Cirrus to get back up to its full insulation potential a lot faster than Hydrophobic down or synthetic insulation that is formed into a sheet.
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