Auto Ventshade 194852 In-Channel Ventvisor Side Window Deflector, 4-Piece Set for 2016-2018 Kia Optima 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 Made in the USA and backed by a limited lifetime warranty