I can't say that this product actually makes my lips fuller, but it is very moisturizing, and the moisture sticks around for a long time. Unlike most non-balm lip products, though, this one isn't sticky at all. It goes on silky smooth and stays in place for hours. It's not the best product to wear under a lipstick, as it keeps the lipstick from adhering to your lips, but it's great for before bed or if your lips start feeling chapped.