| http://www.w3.org/ns/prov#value | - It is preferred, however, to form the device as shown in the drawings, as a generally tubular shaped bladder 18 having its upper and lower opposing inner surfaces sealed to each other at regions 20 to form a plurality of foot supporting cushions 21 when the bladder is pressurized with a suitable fluid, such as air, water, or the like.
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