La Prairie Cosmetics. Maschera caviar skin sleep. High-tech cosmetic night treatment. It is a maschera mask and a night cream at the same time. It increases firmness and elasticity of the face and purifies the skin from daily aggressions. Its formula consists of highly nourishing caviar extracts, which prolong the effects of the cream. Apply a film with the special brush on clean face one to three times a week.