I splurged on some fairly pricey down pillows, so there was no way I was going to fail to protect them. I imagine these would be good to improve the quality of lesser pillows, too, as machine-washing and drying them is them is a cinch. But if, like me, you're buying pillows you intend to use for many years, these are a must, reassuringly good quality, keeping the indoor environment fresh and healthy. Recommended.