| 摘要 |
A sports activity device is provided comprising a toroidal section having an outer shell and an inner portion comprising an inflatable rubber bladder or a foam insert. The inner portion is accessible by means of a closing mechanism, such as a zipper, disposed along the inner circumferential portion of the outer shell. The zipper also serves to provide structural support to the toroidal section. A flexible material is attached to the upper portion of the toroidal section so as to create an uninterrupted planar surface that stretches across the toroidal section. Insignia or advertising may be imprinted upon the flexible material.
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