Best waterproof long-wear foundations under $10

Top pick: Maybelline Super Stay 24H Full Coverage Liquid Foundation. It's the closest thing to a true 24-hour, sweat-and-water-resistant base in this price range — full coverage, matte finish, and it stays put through heat and long days. If you want the longest wear you can get for the money, start here.

Who the others suit:

• Maybelline SuperStay (30Hr, matte): if you want maximum wear time and a shine-free finish for oily skin.
• COVERGIRL Outlast All-Day 3-in-1: if you prefer a cream-to-powder feel and a huge pool of reviews to lean on.
• Estée Lauder Double Wear (travel size): if you want a prestige formula and only need a small bottle.
• Flawless Stay Matte: if you want medium-to-full matte coverage and a strong rating.
• AOA Flawless: if you're on the tightest budget and want something light and vegan.
• Color-changing / spray / brush-in options: fun and cheap, but wear time and waterproof claims are the least proven.

One honest note: at this price, "waterproof" is usually water-resistant at best — set with powder and a setting spray for real staying power.