Environ Skin EssentiA Vita-Antioxidant AVST Moisturiser 4 and 5 are the fourth and fifth step moisturiser in the AVST step-up system. Infused with a high concentration of vitamin A and C, as well as a range of antioxidants, peptides and moisturisers, this creamy product will leave your skin feeling revitalised and refreshed with a more youthful appearance.