HOdo Picnic Blanket Extra Large Outdoor Camping Oversized Sandproof Mat - E. OVERSIZE: 200x200cm extra large polyester fleece soft fabric outdoor blanket. WATERPROOF&SANDPROOF&DURABLE PEVA BACKSIDE: It is made of PEVA,compared to other blankets made of aluminum,the back of this material is more durable and elastic than a picnic sheet made of aluminum.