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Let $X$ be a Noetherian separated scheme of finite Krull dimension. We showthat the layers of the slice filtration in the motivic stable homotopy category$\stablehomotopy$ are strict modules over Voevodsky's algebraic cobordismspectrum. We also show that the zero slice of any commutative ring spectrum in$\stablehomotopy$ is an oriented ring spectrum in the sense of Morel, and thatits associated formal group law is additive. As a consequence, we get that withrational coefficients the slices are in fact motives in the sense ofCisinski-D{\'e}glise \cite{mixedmotives}, and have transfers if the base schemeis excellent. This proves a conjecture of Voevodsky \cite[conjecture11]{MR1977582}.

On the Orientability of the Slice Filtration