Sleep Protection pillows are filled with a fine hypoallergenic synthetic fill, which gives excellent support and dreamy comfort all through the night. In addition to comfort and support, Sleep Protection pillows utilize MicronOne fabric technology, creating a clean barrier between you and potential microtoxins that build up naturally over time in every pillow. The innovative fabric in the pillows block pesky micro-toxins , like dust mites, mold spore, pollen, bed bugs, and even pet dander for those who enjoy cuddling up next to their cat or dog.