Tow Mater, or simply Mater, is a character in the 2006 animated Pixar film Cars and its sequel as well as the spin-off series Mater's Tall Tales. He is voiced by Larry the Cable Guy and inspired by a 1951 International Harvester tow truck. Originally portrayed as a sidekick and friend to Lightning McQueen, he was featured in Cars Toons: Mater's Tall Tales and in other media related to Cars.
Mater's color was originally baby blue as shown in a flashback; however, over the years he has rusted into a patchwork light brown/orange color with some of the blue still showing through. He is missing his hood and his left headlight.
Source: Wikipedia, "Tow Mater", available under the CC-BY-SA License.