Former basketball player Saad Kaiche, who is 7 feet 6 inches (229 cm) was Eneko Sagardoy's body double for some scenes. For others, Sagardoy wore prosthetics on legs, arms/hands, chin, ears and teeth to portray his character, who is affected with acromegaly.
Movie is based on a true story. Known as the Giant of Altzo, Miguel Joaquin Eleicegui was born in 1818 suffering from acromegaly disease, popularly known as gigantism. As a result, he grew to 7 feet 10 inches and he weighed in at about 470 pounds (212 kilograms).