HipGrip Pillion Belt and protective sleeve.
Give your pillion something to hold on to. 

One size fits most. From 74cm (27in) waste to 121cm (47½ in) HipGrip pillion belt has been made durable enough to cover a wide range of uses outside of the motorcycle world.
Some other uses include...

Personal Water Craft
Horse Riding
Film Industry
Aged and Disability
Care