This top is made from Chillproof material with an inbuilt reflective function. The short sleeve design allows for more arm freedom with the ultimate versatility by being able to zip up for 100% warmth and protection, or zip down when the sun comes out or your work rate goes up. It also has a high collar to keep your neck warm. This is a great summer top that can be teamed up with a Rapid Dry top for sun protection.