Matouk Petra Diamond Matelasse Box Spring Covers. A classic matelassé diamond design, Petra's simplicity belies a sumptuous elegance that establishes it as a signature in the Matouk collection. Demonstrating our artisanal savoir-faire, the Petra box spring cover is crafted in soft cotton with a subtle sheen. Materials: 100% Cotton Matelassé Origin: Made in the USA of fabric from Portugal. To Launder your Matouk Bedding: Machine Wash in warm water. Do not use bleach or fabric softener. Tumble dry on low heat and iron as needed on Cotton Setting. Custom Sizes Available. Contact us for Custom Quote. Collection: Matouk Bedskirts and Box Spring Covers