This article was first published on Sole Collector.

Skechers isn't backing down against Nike's patent infringement lawsuit from earlier this year. 

According to The Fashion Law, Skechers has filed a petition for review in light of Nike's claims that Skechers violated its Flyknit patents. Skechers' argument is that Nike's knitted tech isn't as unique as it seems, and that its similarities to designs from Italian brand Missoni should render Nike's patents invalid.

Skechers also cites Dolce & Gabbana as a pioneer of knitted shoes. "Knit footwear became a fashion staple in 2010 when high-end fashion designers Dolce & Gabbana and Missoni debuted several knit footwear styles in their fall 2010 collections," the petition reads. 

In other words, Skechers isn't exactly saying their design is original, but saying that Nike should've never been allowed to file a patent for the technology in the first place. 

Read more on the latest developments of this case here.