Using these Casey Cotton Fitted Sheets is a piece of cake. Just place the sheet on your half - queen bed (40cm), making sure the tags on the sides help you get the orientation right. When it comes to washing, you can toss them in the washing machine on a gentle cycle with mild detergent. This will keep the fabric in great shape. Avoid using harsh chemicals or bleach as they can damage the cotton. After washing, tumble dry on a low setting. These sheets are durable, but it's still a good idea to avoid overloading the washing machine to prevent excessive wear. With proper care, they'll provide you with many nights of comfortable sleep.