Incorporating Polartecs new Alpha insulation, the Rab Strata Hoodie is at the cutting edge of technology when it comes to active mid/outer layers. With a Pertex Microlight outer, it offers incredible warmth for its weight and has a tiny pack size, for ease of transportation. The big bonus is the jackets breathability; Polartec Alpha is the first puffy synthetic insulation to be both lightweight and fully breathable, allowing you to stay warm without feeling clammy during periods of high activity. Features Pertex microlight outer Zoned wovan nylon and polyester mesh fabric inner Polartec Alpha’ insulation Zoned fabrics and insulation Over or under helmet hood, Lycra bound YKK front zip, chin guard 2 YKK zipped handwarmer pockets 1 YKK ziped chest pocket, doubles as integrated stuff sack Elasticated cuffs, hem drawcord Fit: Slim Glossary Pertex Microlight:A high tenacity ripstop weave that is lightweight, down proof and fibre proof. Primaloft one:Ultra fine fibres are specially treated in a patented process and then combined into an insulating core that is incredibly soft, lightweight and water resistant. PrimaLoft One absorbs 3 times less water, is 14% warmer when dry and is 24% warmer when wet than the competitive insulation.