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 lightweight vest takes that original idea & makes it lighter! The VR Vest is incredibly versatile & offers year round protection for mountain activities by balancing warmth, 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. This super lightweight & high performance vest is incredibly versatile & provides outstanding weather protection & high levels of breathability. The acclaimed Vapour Rise Lite system performs brilliantly resulting in a sportier, feather weight, high wicking vest that provides lightweight core warmth. Rab have added their own Matrix SWS stretch softshell panels under the arms to provide comfort & unrestricted movement. Use this vest as a light mid layering piece to provide essential body core insulation, or as an outer layer to protect from wind & rain with completely unrestricted movement. 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 20D Equilibrium fabric Wicking micro fleece drop liner Matrix SWS softshell stretch underarm panels YKK front zip with internal storm flap & chin guard Lycra bound collar YKK zipped A line pockets Lycra bound arm holes Lycra bound hem Slim fit