With this half-zip top, you can enjoy uncompromising performance that doesn't raise your carbon footprint. That's because our relaxed insulating microfleece top is made from smart polyester fibres recovered from spent carbon using award-winning CO2 Renu technology blended with recycled polyester. Featuring contrast half-zip fastening, and elasticated bound hem, cuffs and collar. Advanced insulating top from Craghoppers. CO2 Renu uses a mix of recycled polyester and smart polyester fibres recovered from waste carbon to create the ultimate eco-friendly fleece. Featuring half-zip fastening with zipped handwarmer pockets and elasticated bound hem, cuffs and collar.