Building upon the original PureBoost, the March 2015 of the PureBoost 2 'Onix' sneaker modifies the silhouette with an updated design. The shoe features a lightweight mesh upper like its predecessor, but with improved breathability. Synthetic midfoot overlays, outfitted with perforation, incorporate into the lacing system for locked-down support. A responsive Boost midsole sits underfoot, coupled with a rubber outsole.