Riverstone - Seine engineered hardwood is made of European Oak and offers a Character grade with a Hard-Wax Oil finish. Featuring a 5/8" thickness and a 4mm top layer, this flooring is suitable for a variety of installation methods, including glue-down, nail/staple, and floating. It is hand-sculpted with a light wire-brush and provides 23.315 sq. ft. per box. Riverstone - Seine is perfect for radiant heat and its limited lifetime warranty promises structural integrity for years to come.