Slug Balm is a silky, non-sticky jelly balm made up of a plant-derived, lightweight (yet seriously effective) formula that melts into the skin, creating a cocoon-like environment for your skin to repair itself. Slug Balm is a silky, non-sticky jelly balm made up of a plant-derived, lightweight (yet seriously effective) formula that melts into the skin, creating a cocoon-like environment for your skin to repair itself.