An adjustable seat cushion for use on a support surface such as the seat of a motorcycle. The seat cushion is cellular and laterally spreadable inwardly or outwardly depending on the space between the ischial tuberosities of a user seated on the cushion for improved comfort. In an embodiment, the cellular cushion cups the buttocks and also tilts the pelvis of a user seated on the cushion forward for enhanced seated stability.

 
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> Booth assembly

> Bicycle wheel securing structure

~ 00574