Laura Mercier Real Flawless Weightless Perfecting Concealer in shade 3W1 is a 5.4ml serum-infused concealer for anyone who wants to conceal while caring for the skin. Its weightless formula offers medium, buildable coverage with a natural finish that brightens, hydrates and smooths. The shade 3W1 is light-to-medium with warm undertones. It is crease-proof and waterproof, with up to 16-hour wear.