The Freeport-based retailer is accused of intentionally and willfully plagiarizing a patented 'heel cup' that is featured on millions of Skechers shoes.

California-based Skechers — one of the world’s largest footwear companies — claimed L.L.Bean stole two of its patented “heel cups” designs that surround the back of the foot, according to a complaint filed Monday night in Manhattan federal court.

LL Bean has been sued by footwear maker Skechers USA , which accused the clothing and outdoor gear company of illegally copying its shoes, which have sold in the millions.