Shevron Window Sox
Price: £33 a pair Contact: 01904 705271, www.windowsox.co.uk
Best Buy: Uniquely, these slip over the rear door, covering the entire window (so it can be opened) and cut out more light than any rival. Velcro tabs stop them riding up and the car-specific Sox fit in seconds. Some may not like how they look and you need a car with a rear door. But no rival improves passenger comfort like these.