X-Tred, a self-ballasting walkway pad made from 100% TPO, requires no heat welding or attachment to the roof's membrane system and won't buckle or blow away. Intended for use on TPO, EPDM, and modified bitumen roofing systems, the product features a cross tred design for less thermal expansion and greater impact resistance in the cold. Its open grid enables water to drain and minimizes ponding. The loose-laid design allows for easy removal. X-Tred Walkway Pads by Firestone. Circle 213.