(CNN) A variant of the shoe that powered the first ever sub-two-hour marathon could be yours later this year.

The Air Zoom Alphafly NEXT%, a version of the prototype Eliud Kipchoge wore when he ran a marathon in 1:59:40 in Vienna last October, will be released in summer 2020, according to Nike.

With a thick foam sole and added cushioning under the forefoot, the shoe looks like it has been pulled out of a sci-fi film. Running purists say the technology could harm the integrity of athletics, while Nike calls it a sign of "game-changing progress."

Long distance times have tumbled since Nike's Vaporfly range was introduced in 2016, including Brigid Kosgei's 2:14:04 marathon in Chicago last year , knocking over a minute off Paula Radcliffe's previous record that had stood for 16 years.

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