Thick EVA foam runs the length of the deck here, wrapped in waterproof PU leather that wipes clean after an oil change; the 30 by 5 by 1.6 inch cushion and a separate 9 by 5 by 2.2 inch headrest support spine and skull independently. Robust metal tubes with four reinforced crossbars underneath carry 330 pounds. The board measures 36 by 14.5 by 4 inches, low enough to clear a jack-stand setup, and six universal wheels of 2.5 inch diameter turn 360 degrees on shop concrete. Nothing needs assembling; it arrives ready to roll. When the job ends the frame folds to 18 by 14.5 by 5 inches and hangs on a hook, and at 11 pounds it goes in the trunk for roadside work as easily as it stays in the garage.