The Topper is a concrete blanket whose technology protects freshly poured concrete from weather. Constructed of laminated layers of cross-woven polyethylene and bubble pack, it is water resistant, durable, flexible, and lightweight. With its black side up, it keeps concrete warmer in the winter. In the summer, use it with the white side up to reflect the sun's rays and keep concrete cooler. Insulation Solutions Inc. 866-698-6526.