| 摘要 |
A waterbed mattress sheet an insert, combination having waterbed sheet flaps defining pockets into which resilient, sheet-anchoring inserts can be placed, serving to secure the sheet over the waterbed mattress since the inserts conform in shape to the sides of the mattress and extend underneath the lower edge portions of mattress a short distance, being wedged between the matress and its support frame by the weight of the water in the waterbed mattress and any load placed thereon and being removably restrained in that position by the weight of the waterbed mattress and any load placed thereon against wrinkling, folding, creasing or slipping.
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