The two largest law firms in the world by revenue, Kirkland & Ellis and Latham & Watkins, are advising on German shoe brand Birkenstock’s initial public offering on the New York Stock Exchange—reportedly one of the biggest IPOs of the year.

Birkenstock, the Rhineland-founded shoe brand best known for its comfortable, cork-soled sandals, enjoyed its first day of trading on Wednesday. It priced its IPO at $46 a share, giving it a total value of $8.6 billion.