Advanced Sleep Technology products are designed with scientific research in mind. The AST line of memory foam pillows are carefully constructed to blend medical research data with years of experience working with foam products. Advanced Sleep Technology products are a balanced blend of science, comfort and artistry in order to offer the perfect visco-elastic memory foam products.100% Pure bamboo charcoal visco 5 lb Visco Ventilated for air flow 3 Year warrantyAssembly Required: No Country of Manufacture: China Max Depth: 27-1 2 Max Height: 5-1 2 Max Width: 16-1 2 Min Depth: 27 Min Height: 5 Min Width: 16 Weight: 4.5