Hydro-Turf Plush Underpad Sheet Hydro-Turf Plush Underpad Sheetin 9 mm., 18mm., or 26mm. Thickness When we say PLUSH, we mean it. This is our softest underpad, with great compression recovery for extreme riders. Sheet thicknesses are available in two sizes: 17.5" x... MSRP: Was: Now: $0.00