My sister runs a charity organization that produces wigs for women who have lost their hair due to cancer treatment.
We are working on a website for her organization and I am looking for a word that implies 'free loan'.
Her charity lends wigs to women in a formal way - borrowers need to fill out an application and, if accepted, sign a legally binding contract outlining borrower's obligations, such as returning the wig when their contract is due, keeping it in mint condition, etc. However it's all free - they won't pay a cent for it (unless they damage the wig).
Whenever someone says 'loan', I always think of a 'bank loan' or something of the sort.
What do you call a formal-but-free loan?