LRPu

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LRPu or low-resilience polyurethane is a material distinguished by an "ability to slowly return to its original shape" (viscosity).[1]

The resulting impact resistance results in LRPu being used in soft laptop sleeves[1] and other lightweight cases for portable electronic equipment, as an alternative to the softer neoprene.

May be related to, or be the same thing as Memory foam.

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