Slug Boost delivers a skin-quenching essence in a convenient, ultra-fine mist. It contains a trio of water-attracting humectants of different molecular weights, which allow for deeper penetration throughout the layers of your skin. Slug Boost not only hydrates, it also preps skin for the rest of your routine. Slug Boost delivers a skin-quenching essence in a convenient, ultra-fine mist. It contains a trio of water-attracting humectants of different molecular weights, which allow for deeper penetration throughout the layers of your skin. Slug Boost not only hydrates, it also preps skin for the rest of your routine.