Made of a 6.5 oz. XR-3 PW polyester material that is approved for potable water contact. Folds down to 18” x 18” and features a 10” filling tube. Withstands hydrostatic pressure, mildew, rot, ozone, ultraviolet light, weathering, cracking, air contaminants and many chemicals. D-rings for anchoring on flat bed. Measure truck bed before ordering.