Polyurethane microcellular foams are closed-cell, flexible-to-firm foams with a high density. It is usually processed with the compression molding process. Parts made from microcellular foams can bear heavy loads, mitigate high impact force, and float in water without absorbing water quickly. Microcellular foams can be used to make padding/cushioning/grip arts for sporting goods and many other products, specialty wheel chocks for airplanes and heavy equipment, general flexible/light parts with good strength, specialty gaskets, wheels/tires for various slow-to-intermediate moving speed products, and many other molded parts. Due to the shrinkage issue, typically microcellular foams are not suitable for open top molding or cast-in-place applications.