Best Choice Products 2" Ventilated Memory Foam Mattress Topper King PREMIUM QUALITY: Designed with polyurethane material, this king size mattress topper (2 density) is dust mite resistant, antimicrobial, and hypoallergenic BREATH-ABILITY AND MAX COMFORT: Features all-over cooling ventilation for optimized air flow and an open cell technology preventing body impressions HEALTH BENEFITS: Memory foam contours the body to improve posture and supports your natural pressure points to help relieve neck, back, and shoulder pains Foam meets CertiPUR-US standards for content, emissions, and durability, and are analyzed by independent, accredited testing laboratories RECOMMENDED SETUP: Open package in well-ventilated area to release harmless odor that should dissipate within 48 hours. Open and wait 24 hours before use to maximize expansion