The Protect-A-Bed Sleep Well Kit creates a healthy sleep zone in 3 easy steps: 1 Install a mattress encasement 2 Cover with mattress protector 3 Add pillow protection. Total coverage solution seals your mattress with 6-sides of protection. FDA Class 1 Medical Device with safety tested and certified by the Standard 100 by Oeko-Tex. Twin and Twin XL size come with 1 pillow protector/ Full, Queen, King and Cal King come with 2 pillow protectors. Twin, Twin XL and Full fit mattresses up 12 depth. Queen, King and Cal King fit mattresses up to 16 depth..