3D MAXpider Second Row Custom Fit All-Weather Floor Mat for Select Chevrolet Sierra Crew Cab/GMC Silverado Crew Cab Models - Classic Carpet (Black) Innovative three-layer structure engineered to protect the interior of your vehicle with style, safety, and comfort in your daily ride Patented MAXpider Bottom Layer keeps mats in place without harming original carpet like Velcro or without leaving marks like nibs of traditional rubber floor mats Three dimensional designs measured to exact cabin contours of your vehicles with raised edges that give maximum coverage and protection to vehicle interior; waterproof; effectively contain mess and spills Surface layer made of looped fabric like carpet to complement your vehicles in the style you desired Semi-hard XPE foaming inner layer minimizes foot fatigue and provides sound barrier for a quieter ride; Yet the material is non-toxic and odorless