Using these Sferra Catena pillowcases is simple - just put them on your pillows and enjoy the softness. When it comes to maintenance, you can machine wash them in warm water on a gentle cycle. But don't use bleach as it can weaken the fabric and make it turn yellow. Also, avoid using fabric softener. Make sure to wash dark - colored pillowcases separately. Tumble dry them on low heat and take them out while they're still a bit damp. You can steam iron them on the 'cotton' setting on the reverse side of the fabric.