Benefit's Boi-ing Hydrating Concealer is a popular choice among beauty enthusiasts for its lightweight formula and hydrating properties. It's designed to hide dark circles and smooth out fine lines, all while keeping your skin moisturized. The concealer comes in a variety of shades to cater to different skin tones. Here's a brief guide to help you find your perfect match:

1. Shade 01 (Light): This shade is perfect for those with fair skin tones. It has a cool undertone that works well to neutralize redness in the skin.

2. Shade 02 (Light-Medium): This shade is ideal for light to medium skin tones. It has a neutral undertone that balances both warm and cool undertones in the skin.

3. Shade 03 (Medium): This shade is designed for medium skin tones. It has a warm undertone that can help to counteract blue or purple tones in the skin, making it perfect for concealing under-eye circles.

4. Shade 04 (Medium-Tan): This shade is suitable for medium to tan skin tones. It has a warm undertone that works well for neutralizing dark spots and hyperpigmentation.

5. Shade 05 (Tan-Deep): This shade is perfect for those with tan to deep skin tones. It has a cool undertone that can help to brighten the skin and conceal dark circles.

6. Shade 06 (Deep): This shade is designed for deep skin tones. It has a warm undertone that can help to conceal dark spots and hyperpigmentation.

Remember, the best way to find your perfect match is to try the product in person. However, if that's not possible, this guide can help you make an informed decision. Always consider your skin's undertones as well as its overall color when choosing a concealer shade.