Sally Hansen double duty is a 2-in-1 base and top coat that protects and strengthens nails. This all-in-one patented strengthening base and top coat works double time, for double protection. As a base coat, double duty moisturizes and hydrates nails with panthenol. As a top coat, double duty protects with nylon. Nails are shielded with a hard, shiny, chip-resistant finish.