Products of special sets of real numbers

We describe a simple machinery which translates results on algebraic sums of sets of reals into the corresponding results on their cartesian product. Some consequences are: 1. The product of a meager/null-additive set and a strong measure zero/strongly meager set in the Cantor space has strong measure zero/is strongly meager, respectively. 2. Using Scheepers' notation for selection principles: S_fin(Ω, Ω^gp) ∩ S1(O,O) = S1(Ω, Ω^gp), and Borel's Conjecture for S1(Ω, Ω) (or just S1(Ω,Ω^gp)) implies Borel's Conjecture. These results extend results of Scheepers and Miller, respectively.