X.S.R.

The Columbia Montrail X.S.R. Collection, which stands for Cross Surface Running, was designed for running on both road and trail conditions. The X.S.R. collection was designed with a focus on maximum underfoot cushioning. This was provided by new midsole foam technology with a smooth transition provided by gait-cycle guidance delivered through midsole geometry. The X.S.R. Collection featured 2 silhouettes: the Variant X.S.R. and the Fluid Flex X.S.R.