Footwear firm Crocs Inc is working to improve conditions across its factory network and is re-using leftover Croslite material in every Crocs shoe, according to its first sustainability report, which has just been released.

The report details the company's sustainability-related accomplishments and objectives, and sets goals in workplace and supplier standards, environmental management and community engagement.

In the past year, Crocs says it has helped improve working conditions across its factory network by strengthening training for factories and suppliers on its Supplier Code of Conduct.

It has a particular focus on enforcing appropriate age restrictions for workers, and the company has appointed leaders at all Crocs company-owned factories and key suppliers to conduct audits ensuring compliance with the Code.

Future goals include standardising processes for auditing performance across all company-owned factories and contracted manufacturers in 2013 - and ensuring at least 90% compliance by the end of next year.

When it comes to environmental protection, Crocs says it is re-using an average of 5% Croslite material, left over as scraps from the manufacturing process, in every Crocs shoe.

It intends to increase this to 10%, and reduce emissions of volatile organic compounds (from cleaners, primers and adhesives) used in the manufacturing process by 10% from 2012 to 2013.