Polystyrene insulation is one of the most popular types of insulation on the market today. At Insulation4US, we offer a wide selection of polystyrene insulation products, making it easy to find the right product for your needs. We offer a variety of thicknesses and densities to choose from, so you can be sure to find the perfect product for your project. We also offer free shipping on all eligible orders, so you can be sure you are getting the best possible deal.