SKIN INC PURE DEEPSEA HYDRATING OVERNIGHT MASK Why you'll love it: This clear gel mask feels so good on skin. It's cooling to the touch and soothing, a welcome addition to any routine this time of year when cold winter temperatures and indoor heat can wreak havoc on skin. Spiked with hyaluronic acid and glycerin, it's also incredibly hydrating. "A very thin coat feels calming on my dry, irritated skin," says Calaor, "and it quickly hydrates thirsty patches, like at the tops of my cheeks." How you'll use it: Smooth on the mask and let it sit for 30 minutes or overnight-it's comfortable to sleep in. It's so comfortable we even like to wear it in place of moisturizer on days when skin is feeling like it could use a little extra hydration.