Trainers (training pants) help your child to go to the potty or toilet independently. Children always like to put on these "pants" because they want to be big. The trainers are usually made of only one thin layer of absorbent material, so they can stop minor pee accidents. Depending on the model, they are also equipped with a waterproof outer layer.
Cuffs make potty training easier - with cuffs instead of pants, the child is on the potty in no time!
You can find out more about trainers here!