Construction Made of 50% cotton and 50% linen. Duvet features a button closure with inner ties to keep the insert in place; sham features an overlap closure. Duvet cover, shams, and inserts are sold separately. By choosing our cotton products, you’re supporting our investment in Better Cotton’s mission. This product is sourced via mass balance and therefore may not contain Better Cotton. OEKO-TEX® STANDARD 100: tested against 1000+ harmful substances. 14.HUS.42449 Hohenstein Imported. Care Machine wash in warm water; gentle cycle. Only non-chlorine bleach when needed. Tumble dry on low heat; remove promptly. Warm iron as needed.