KEY DETAILS 100% TENCEL™ cover. Memory foam layer, steel coil layer, responsive foam layer and fiberglass free solution layer. Two-sided design: Firmer side and softer side. 6" Mattress designed for top bunk or trundle bed. 8" Mattress designed for standard beds and bed frames. Best for parents seeking an award-winning mattress with age-specific comfort and advanced kid-friendly features like a hypoallergenic, water-repellant cover and hygienic microbe shield. CertiPUR-US® certified. Sold individually.