In June 2004, Crocs purchased Foam Creations and their manufacturing operations to secure exclusive rights to the proprietary foam resin called Croslite. Croslite is a closed cell resin. The foam forms itself to a wearer's feet and offers purported medical benefits, according to a number ofpodiatrists. Crocs holds one patent covering various utility aspects of its footwear, U.S. Patent No. 6993858 B2 issued February 7, 2006, and three design patents covering various ornamental aspects, U.S. Patent Nos. D517788, D517789, and D517790 issued on March 28, 2006.

As of 2007, the company had applied to register "Crocs" and the Crocs logo as trademarks in over 40 jurisdictions around the world, including the U.S.; many such applications were pending approval. Crocs also extended the scope of their trademark registrations and applications for both the Crocs mark and logo to cover non-footwear products such as sunglasses, goggles, knee pads, watches, luggage, and some of their internet sales activities.

Crocs announced in 2006 that it filed complaints with the U.S. International Trade Commission (ITC) and the U.S. Federal District Court against 11 companies that manufacture, import or distribute products, called "croc-offs", that Crocs believes infringe its patents. Seizures of fake Crocs occurred in 2007 in the Philippines and Denmark, and were under litigation in South Africa. In 2010, the U.S. Court of Appeals for the Federal Circuit held that Crocs'design patent had been infringed.

In 2007, the U.S. Consumer Product Safety Commission requested a voluntary recall of Crocs-like clogs due to a potential choking hazard involving detaching plastic rivets.

Crocs-like brands include Airwalk, Poliwalks, USA Dawgs/Doggers, NothinZ, Veggies etc. Versions of the Croc style clogs have appeared in children's fashion catalogs, usually under their own name brands or as no names. Other knock-offs are in discount stores, amusement park stores, beach stores, department stores, and superstores.

Crocs are made in a variety of styles. They are manufactured in Crocs facilities in Mexico and China, and contract manufacturers in Italy, Romania, Bosnia and Herzegovina, Vietnam, China and Argentina (Saladillo).

The shoes are produced in an array of colors depending on the model. The Classic styles are available in more than 20 colors; most other styles are produced in a palette of four to six colors or two-color combinations.

Crocs also sells other fashion accessories. Jibbitz are decorations that can be clipped to the ventilation holes in the shoes. These include designs, mainly aimed at children, which feature Disney characters. The company has also released a line of purses in a variety of colors.

A "Fuzz Collection" with removable woolly liners extend the range into winter wear.

In 2008, the company entered the golf shoe marketplace, acquiring golf shoe manufacturer Bite Footwear. A Croc-styled pair of golf shoes, the Ace,was introduced.

Some Crocs shoes were tested and recommended by the U.S. Ergonomics company in 2005 and were accepted by the American Podiatric Medical Association in 2009. In 2008, the U.S. government Centers for Medicare and Medicaid Services approved a model of Crocs with molded insoles as diabetic footwear, to help reduce foot injuries.

Footwear such as Crocs and flip-flops came under scrutiny in 2006 in the U.S. and 2008 in Japan when children suffered injuries after the shoes became caught in escalator mechanisms. This was due to the soft shoe material combined with the smaller size of children's feet. In 2008, Japan's Ministry of International Trade and Industry, after receiving 65 complaints of injuries, requested that Crocs change its design.

Internationally, some healthcare facilities introduced policies in 2007 regulating Crocs. Rapid City Regional Hospital in South Dakota changed its dress code to prohibit the sandal variants and those with holes, citing safety concerns, but allowed closed-top "Professional" and the healthcare-focused "Rx" Crocs to be worn. Over one hundred hospitals in Canada were advised to implement similar policies. Blekinge and Karolinska University hospitals in Sweden banned the wearing of "Forsberg slippers" (Foppatofflor) by staff, due to high voltage static electricity buildup which was observed to interfere with electronic equipment. City hospitals in Vienna, Austria announced banning Crocs, often worn by nursing staff, to comply with antistatic requirements.

Crocs announced the Fuse and two others in 2009, formulated to dissipate static electricity in accordance with European standard EN ISO 20347:2004 (E), for use in the medical sector.



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