OMM Core Women's Zipped Running Vest A new concept in active insulation, the OMM Core Range is made entirely from PrimaLoft ACTIVE ultra-light insulating fabric. Built from a synthetic plume woven through a knitted mesh, Core offers the warmth of a fleece but at less than half the weight. Made entirely from Primaloft Active insulating fabric, the Core Zip Vest offers the warmth of a fleece but in less than half the weight. The Core range is an incredibly effective insulator, but thanks to near-total air permeability, the build-up of heat dissipates. The Core Zipped Vest uses the midweight 125g/m2 PrimaLoft ACTIVE Insulating Fabric Technology, which provides extra warmth on wintery or long runs. The Core materials work during wet or dry weather, providing incredible wicking properties and ensuring you don't stay wet for too long. Alongside this, the fabrics will continue to insulate you, even when you're wet. A full-length zip allows for easy on and off, whilst also p