Unfortunately, Vessi Shoes are not yet available in wide sizes.
However, because of their knit material, their shoes tend to fit around the foot much like a sock, and some customers with wide feet report having no issues wearing the shoes.
According to their website, Vessi Shoes will hug and stretch over your feet to adapt to your unique shape over time.
Mentioned in this answer
Vessi Shoes
World's first 100% waterproof knit shoes