Both our Upcycled Poly and Recycled Velvet are NOT heat tolerant.Please be cautious of any heat source you place near or on the fabrics as it can damage or melt the material. For this reason we recommend air-drying the covers without any heat applied.For our Hemp, ironing and steaming are okay on low heat to reduce wrinkles, be sure not to leave the heat on one spot for too long and move continuously.