| 摘要 |
<p>The device has a frontal increased buoyancy zone (1) connected with a central zone (2) of a smaller buoyancy and increased flexibility at least near the swimmer's lower pelvis, entering between the thighs and ending in a rear increased buoyancy zone (3) protruding above lower pelvis. It may have also the elements preventing slipping off, including extensions (5) adhering to the trunk sides. The device can be made from the elastic foil with inflatable chambers, eventually divided into smaller segments, with the chambers from the more rigid thermoplastics, blow moulded during moulding, or from the elastic closed-cell foamed plastics.</p> |
