Holebrook's Martina - the ultimate Wind Proof (WP) sweater for women crafted from sustainable materials in a beautiful, soft grey colour Seeing is believing! This beautiful knitted jumper is made from super soft blended wool, and is fully lined throughout to ensure the wind doesn't get through. This versatile turtleneck 1/4 side zip jumper is so warm and snug it can even be worn as a jacket.