You don’t have to change your foundation every season; stick with the one that works best for you. To control surges of shine, use a primer or mattifying gel before foundation to keep your face fresh. If you use a self-tanner, you may want to buy a “summer” bottle of your foundation that’s one shade darker to match the tanner you. If you like the feel of lighter, more sheer coverage, try a tinted moisturizer with builtin sunscreen. Its texture is the most comfortable in extreme heat.