Crocs (CROX) - Get Report, a maker of casual shoes, many of which have holes in them by design, is buying a company that makes button-like accessories that can be placed in the holes.

The acquisition of the company, Jibbitz, will cost $10 million. Crocs could pay as much as an additional $10 million if Jibbitz hits certain earnings targets.

In addition to making accessories for Crocs, Jibbitz also sells bracelets and anklets that can be customized with its snap-on buttons. Shares of Crocs were up 3%.