Nike Air Tech Challenge II White/Clay Blue The Nike Air Tech Challenge II came back for the first time in the Hot Lava color just over a month ago and was received quite well. The second color to release is not quite as eye catching, but still a very unique blend of “Clay Blue” and “Tart”. Officially these are a June release, but like the past Air Tech Challenge II’s, have released a week early. Long Beach spot Proper has received them in store, but Nike has also made them available online at NikeStore.com, but already several sizes have sold out.