According to Forbes, “The best pillow protectors safeguard your pillows from sweat, spills, allergen triggers and just about anything else that can ruin a pillow. They also help you cut down on laundering pillows themselves, since you can wash the pillow protector rather than the whole pillow—something that can cause the fabric and fibers to degrade faster.”
Pillow protecters that are CERTIFIED asthma & allergy friendly® go a step further as they undergo independent scientific testing to achieve the certification mark. The scientific standard ensures that bedding items form a sufficient barrier to allergens like dust mite allergen. If there is dust mite allergen on a product, it should be possible to remove this material through washing, so products should be of suitable quality to enable them to be washed regularly to reduce allergen build-up. The bedding is also tested for chemicals that can cause sensitivities or even allergic reactions.
The Forbes article describes Protect-A-Bed as follows:
While most pillow protectors help keep your pillow clean and block some impurities, not all are suitable for those with allergies. Dr. Agarwal recommends looking for pillow protectors that are asthma and allergy friendly certified, which is a certification from the Asthma and Allergy Foundation of America (AAFA) certified and Allergy Standards Limit (ASL). This certification ensures the pillow protector is effective against allergens and triggers, which is why we recommend this one from Protect-A-Bed. Not only does it protect against allergens, but it’s also waterproof to block liquids and sweat while still remaining breathable and noise-free.