“Medida Certa” is a playful sertanejo tune in which the singer phones an old flame with a not-so-subtle invitation: “swing by my place tonight if you’re free.” He pretends he is totally over her, yet every line gives him away. Instead of owning up to his longing, he blames the objects around him: his comb misses her hair, his mirror complains it has not seen her, even his car keeps parking near her house. These humorous excuses paint a picture of a man who is desperate to reconnect but too proud to admit it.
Behind the jokes lies a sweet confession. The room, the pillow, the sheets - everything in his world says she is the perfect fit, the medida certa (exact measure) for him. By the end, the listener realizes the truth he tries to hide: he is still hopelessly in love and hopes she will fill that perfectly sized space beside him once again.