However, this method has the effect of compromising commercial wear ratings. While felt backed carpet tiles have traditionally been viewed purely as an underlayment for underfoot comfort, carpet tiles featuring QuietBackTMÂ have been designed specifically for sound absorption. The air flow, breathable feature of QuietBackTMÂ is the result of removing harmful and sound-inhibiting PVC, bitumen and fiberglass substrates, allowing the product to offer both environmental and acoustical benefits. By eliminating such sound-reflecting substances, carpet tiles featuring QuietBackTMÂ deliver a superior noise absorption capability for the floor.