Features: Remember to leave it in a well-ventilated area for 24-52 hours for best results You can use a hair dryer to speed up the expansion process, but avoid overheating to prevent damage Unlike most memory foam wedges, ours won't leave you feeling flat. It stays firm even after multiple uses, effectively preventing any pain. Say goodbye to soreness! Specifications: Material: made with hypoallergenic, machine washable, triple-layer soft fabric, Color: white Size: about 59.06 x 31.5 x 5-0.98 inch Package includes: 1 x Under Mattress Support Notes: Manual measurement, please allow slight errors on size. The color may exist a slight difference due to different screen displays