Simmons BeautyRest 400 Thread Count Allergy Care Mattress Pad with BioShield WhiteFull Size: Full - Color: White Simmons BeautyRest 400 Thread Count Allergy Care Mattress Pad with BioShield. This 400 thread count 100% Pima cotton top fabric with BioShield long lasting anti-microbial protection gives you superior comfort. Stain release fabric protection for easy care. Back is 100% polyester with a laminate protection. Allergen reduction BioShield anti-microbial protection will not dissipate over time and holds up to multiple launderings. Eliminates some common allergen causing microbes. The patent... Material Content: 100% 400 Thread Count Pima Cotton Skirt: Expand-A-Grip skirt Back: 100% Polyester with Laminate Back