Flotation trampoline

A flotation trampoline adapted for use on a body of water, comprising:

• a non-elastic, collapsible encasement having a symmetrical configuration resembling an innertube when fully expanded and which includes a lower, interior tube surface commencing at the innermost perimeter of the tube opening and continuing downward to a second perimeter occuring on the lower tube surface at the innermost locus of contacts which would occur with water when the fully inflated tube is positioned on a still water surface, said tube having a diameter of at least three feet;
• inflatable support means contained within the encasement and adapted with means for receiving air therein to expand and support the collapsible encasement;
• a base cover attached and sealed at a perimeter on the lower, interior tube surface to seal off rapid air flow through the tube opening to the base of the tube to thereby create a substantially closed volume between the base cover, lower interior tube surface and a water surface upon which the tube is placed;
• and
• a resilient, trampoline mat positioned over the tube opening near the top of the tube encasement and attached to the encasement and displayed above said base cover thereby defining a second closed volume for use as a trampoline jumping surface.