Product of scalar superfields

A product of scalar superfields is a scalar superfield: the pullback of a product is the product of the pullbacks at the same transformed superspace point. Infinitesimally, the even supersymmetry variation obeys $\delta (ST)=(\delta S)T+S(\delta T)$. This follows from the graded Leibniz rule for the odd supercharges, after including their odd parameters.