Rab Carrington (as in the Rab in Rab!) originally devised the Vapour-Rise concept by combining the technology of high wicking micro fleece & Pertex Equilibrium fabrics to produce a single garment with a 2 layer construction that offers superb weather protection & immense breathability. This is a supremely lightweight & highly breathable hooded jacket that uses a slimmed down version of the highly acclaimed original Vapour Rise system, making it lighter, sportier & more desirable resulting in a feather weight, high wicking top that works as a base layer, mid layer or outer layer. This incredibly versatile jacket offers year round protection for mountain activities by balancing comfort, windproofing & breathability; what more could you need? The 2 layer Vapour-Rise technology uses your body heat acts as a pump working with the micro fleece brushed lining to push moisture away from your skin & move it to the face fabric. Pertex Equilibrium face fabric has larger filaments on the inside & smaller filaments on the outside. The laws of capillary action dictate that moisture will move from large filaments to smaller ones, pulling your sweat away from the lining & spreading it out over the large outer surface area. This evaporative heat loss & moisture wicking create a temperature equilibrium to keep you comfortable & dry in all conditions. Finally a robust DWR treatment on the outside repels water. The Vapour Rise Lite Alpine Jacket features a fixed hood with a proper wired peak & Rabs brilliant hood design, which I personally think is one of the best. You also get two chest pockets that wont interfere with your pack or your harness. Because the Vapour-Rise Lite Alpine breathes so well it works perfectly as mid layer under your hardshell if the weather turns really nasty. We recommend using the Rab Aeon Tee under Vapour Rise garments as its silky smooth fabric glides smoothly against the VRs wicking liner & maximises the wicking properties. Pertex Equilibrium outer Wicking micro fleece drop liner Fully adjustable helmet compatible hood with wired peak & roll down tab YKK front zip with internal storm flap & chin guard YKK zipped Napoleon pockets 1 zipped internal pocket Low bulk Velcro cuff adjustment Hem drawcord Slim fit