Arden European Oak engineered hardwood floor by Monarch Plank Hardwood Flooring. Experience natural beauty of European Oak sourced from responsibly managed forests in Europe and the U.S., with use of the most eco-friendly adhesives and finishes available. Arden European Oak of Windsor collection features smooth texture and rustic grade with natural treatment of the wood. Dry-sawn 3.5 mm tick top layer. Made with a formaldehyde-free adhesive (EPI), contains no added formaldehyde of any kind CARB ATCM Phase II Compliant. Lifetime structural, 25-yr finish warranty.