Polyester is generally more resistant to shrinkage than natural fibers like cotton, but it's not entirely immune. While it can withstand normal washing and drying temperatures, high heat can cause it to shrink slightly. If you're washing your polyester clothes in cold water and drying them on a low heat setting, you're unlikely to notice any significant shrinkage. However, if you're putting them in the dryer on a high heat setting, you might notice a slight decrease in size, especially if the fabric is blended with other materials. To be safe, it's always a good idea to check the care label for specific washing and drying instructions.