Acrylic bathtubs are vacuum formed using 2 sheets of acrylic, which allows them to be made in a wide range of styles and sizes. The acrylic is reinforced on the inside with fiberglass to add strength. They feature support bars and adjustable feet that add strength to the bottom of the bathtub. All Wesley Collection Acrylic Bathtubs feature our exclusive MagnaWarm expanded foam insulation which adds weight and rigidity to the bathtub.