Cloth Diaper trials are programs that allow you to pay a deposit on a certain number of diapers and try them out for a select period of time. The deposit is almost fully refundable if you send all of the diapers back, which makes it a very affordable way to try out diapers before you buy a whole stash. (The diapers do need to be sent back clean and in good condition.)
Diaper trials are very useful for those who are not sure what kind of diaper will work for them and their baby, or for those who are not sure what brand to choose. Some programs have preselected items, and some programs allow you to choose exactly which diaper(s) you would like to try.
Below are some links to some of Thirsties retailers that offer cloth diaper trials: