Patent ID: 6968582

Claim:
Top-bedding comprising: a. a head-end delimited by a head-end edge, said head-end edge having a first terminus and a second terminus; b. a foot-end opposite said head-end, said foot-end delimited by a foot-end edge substantially parallel to said head-end edge; c. at least one pair of opposing sides delimited by side-edges; d. a first head-end corner formed at said first terminus of said head-end edge by the intersection of said head-end edge and one of said pair of said opposing side-edges; e. a second head-end corner formed at said second terminus of said head-end edge by the intersection of said head-end edge and the other of said pair of said opposing side-edges; and, f. at least one reversible expansion means located at the head end reversibly converting said top-bedding from a closed configuration to an open configuration, wherein said reversible expansion means comprises a plurality of reversible pleats such that the closed configuration is approximately rectangular and the open configuration has the shape of an irregular, simple polygon wherein the distance between said first head-end corner and said second head-end corner is greater when said top-bedding is in the open configuration than when said top-bedding is in the closed configuration.