LRPu or low-resilience polyurethane is a material distinguished by an "ability to absorb force and then slowly return to its original shape" [http://www.macworld.com/article/59448/2007/08/sleevesbrief1.html macworld covers LRPu] ] making it "an ideal material for soft laptop sleeves" and other lightweight cases for portable electronic equipment. See also * References
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Memory foam — is polyurethane with additional chemicals increasing its viscosity and density. It is often referred to as visco elastic polyurethane foam, or low resilience polyurethane foam (see LRPu). Higher density memory foam softens in reaction to body… … Wikipedia
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