NEXT LEVEL TRAILBLAZER. The Chuck 70 AT-CX takes the best-ever design you know and love to new heights, with new purpose. Made for outdoor runners, the Chuck 70 AT-CX merges performance and comfort features to help you cover more ground than ever. A higher, platform midsole and CX foam cushioning provide all-day comfort wherever your route takes you. The silhouette maintains the classic Chuck 70 look, while a durable Bosey toe and rugged, new traction outsole encourage you to explore daringly, without leaving style in the dust.