XtraTuf is a brand of neoprene

Neoprene

Neoprene or polychloroprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. Neoprene in general has good chemical stability, and maintains flexibility over a wide temperature range...

 boot

Boot

A boot is a type of footwear but they are not shoes. Most boots mainly cover the foot and the ankle and extend up the leg, sometimes as far as the knee or even the hip. Most boots have a heel that is clearly distinguishable from the rest of the sole, even if the two are made of one piece....

s manufactured by Norcross Safety Products
of Rock Island, Illinois

Rock Island, Illinois

Rock Island is the county seat of Rock Island County, Illinois, United States. The population was 40,884 at the 2010 census. Located on the Mississippi River, it is one of the Quad Cities, along with neighboring Moline, East Moline, and the Iowa cities of Davenport and Bettendorf. The Quad Cities...

. They are in very common use in southern Alaska, where they are known as "Alaskan Tennis Shoes"
or "Alaskan Sneakers". due to their being generally acceptable dress for a wide variety of occasions and venues. Nicholas Hughes

Nicholas Hughes

Nicholas Farrar Hughes was a fisheries biologist known as an expert in stream salmonid ecology. Hughes was the son of the American poet Sylvia Plath and English poet Ted Hughes and the younger brother of English artist and poet Frieda Hughes...

was known to have favored them when he lived in Alaska.