PCT No. PCT/FR90/00743 Sec. 371 Date Jun. 16, 1992 Sec. 102(e) Date Jun. 16, 1992 PCT Filed Oct. 16, 1990 PCT Pub. No. WO91/05720 PCT Pub. Date May 2, 1991.A rigid wraparound shell defining an inner space containing at least one sealed chamber is provided. The rigid wraparound shell (1) is comprised of flexible sealing walls (2,3) which together define a sealed enclosure (5) having a lower pressure that the ambient pressure, and of a filler material (7) which completely fills the low-pressure sealed enclosure (5). The filler material (7) is rigid when it is inside the low-pressure sealed enclosure (5) and can be flexible when subjected to ambient pressure. This shell structure is particularly useful in making floating and/or sliding devices such as floats, hulls for boats, windsurfing boards sledges, skis, tanks, devices for holding and/or supporting the human body in a natural position or in a predetermined position, such as anti-bedsore mattresses or cushions and surgical mattresses, and devices for holding and/or supporting at least one object in a cavity such as a piece of luggage, container, a vehicle boot or the like.
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