Cotton ? This is an duvet cover only. Does not include a weighted blanket ? ULTRA PLUSH and PREMIUM QUALITY: We utilize the highest quality & softest material that on the market today. Our covers will enhance your weighted blanket experience and lengthen the life of your blanket. ? ALL SEASON WASHABLE DUVET COVER FOR A WEIGHTED BLANKET: After a day in the sun, or cuddled up by the fire, our blankets work for all seasons. ? MONEY BACK GUARANTEE: While other sellers only provide a limited time warranty, we offer a 100% Money Back Guarantee. You can trust us – over 50,000 happy customers already do!