Thanks to technical materials and Rab's knowhow, this vest is warm for its weight. It is also very packable. - Regular fit - Light but durable Pertex Quantum surface fabric - High quality PrimaLoft insulation, 60g/m² at the front, back and collar, 40g/m² on the sides and along the spine - High, protective collar - Two zippered lower pocketes, one of which doubles as a stuffsack - Center back length 64.5 cm For the technically inclined, the surface fabric has a cfm rating of 2 and the liner fabric lies at 10. What this means is that the outer fabric boasts great wind resistance, while a more airy fabric has been chosen as the liner.