Review on Premium 2 Pack Car Side Window Sun Shades - Cozybiub: Protects Baby, Kids, and Pets from Sunburn, Heat, and UV Rays - L Size, Covers Windows Up to 44x23 Inch - Ideal for Small, Medium, and SUVs (RVs Not Included) by Jeff Henkhaus

I have the medium one and it fits my 2010 Malibu perfectly. It was a little big but still fits our 2008 Pontiac G6 which is very similar to the Cobalt. However, the medium size did not fit my Dodge 1500, for most trucks you need a large one. I love it because it shades my kid in the car and I can still roll down the windows. So if I have to put her in a hot car I can now roll down the windows and not worry about bugs hitting her or blinding her, but she still gets a good breeze. Even after parking in the sun, the car is noticeably cooler than without. They survived the journey from Wisconsin to SD and back. They're on all the time when the teu is fading in the sun, so I don't recommend leaving them on 24 hours a day, 7 days a week.