OJIA Memory Foam Seat Cushion Chair Pads Chair Cushion with Tie - 15.7''*15.7''*1.97'' (Gray) Polyester Relieves Pressure Comfortable seat for individuals sitting in chairs, riding in cars, scooters, etc. Encased in removable and washable luxurious zippered blue velveteen cover. The sculpted design is anatomically correct and provides maximum comfort. Kindly note that Memory foam cushion are made out of viscoelastic foam. It's softer in warmer environments and colder in cooler temperatures, memory foam product has been subjected to temperatures lower than 40 degrees Fahrenheit, it will feel unusually firm or hard, so it is important that you let it conform naturally to its new indoor environment prior to use, also memory foam softens and becomes more pliable when heat is applied to it. Normally, the heat from a person's body is enough to soften the memory foam. But sometimes, when the weather is cold, the body does not give off enough heat to soften the foam. Without body heat softening the foam, the cushion can be hard and uncomfortable.