The most versatile piece of insulation in the MONTANE range. The Prism is an essential piece of mountain clothing whatever the activity. Uses 40g PRIMALOFT synthetic insulation, a fill that is warm and lightweight enough that enables it to be worn on the move while working hard in cool conditions. The Prism is perfect either climbing in England's Lake District, scrambling high in the Rockies or as packable insulation trekking in Nepal. Featuring an outer shell of PERTEX Microlight a fabric that is completely windproof and remarkably fast drying. Worn by outdoor professionals and Mountain Rescue teams across the UK, the Prism is a truly functional outdoor mountain jacket.