Product details:

The Auto Ventshade 194167 In Channel Ventvisor Window Deflector helps reduce the greenhouse effect in your vehicle. It will allow you to keep your window cracked during hot weather to reduce the heat build-up in a parked car. These items are ideal for helping your car stay cooler when you have to park in the direct sunlight. This car window deflector, four-piece is designed to be an exact fit for 2010-2015 GMC Terrains. It is constructed of strong and flexible high-grade acrylic material in gray and black. The sleek appearance adds a modern, clean look to your car that can be installed in all four windows. The color of these in channel window deflectors will complement and accent your current SUVs color.Installs in window channel for a sleek, streamlined appearance; Tinted, reinforced acrylic is UV and scratch-resistant and is car wash safe
Allows fresh air to naturally circulate through open windows while keeping the rain out
Reduces heat build up in parked vehicles by allowing window to be kept partially open
Installs in minutes, no drilling or special hardware required; Please note special instructions for In-Channel Ventvisors on installation guide