I use Garnier Fructis Leave-In Conditioning Cream as my anti-humectant aid, which has been working fantastically. In addition to a leave-in conditioner, I'll be adding a moisturizer to my daily routine. I usually try to thoroughly moisture my curls 3 days a week, but the sun is sucking up a lot of that moisture leaving me dry. Remember moisture, moisture, and moisture. Your hair needs it regardless of the season, but summer hair counts on moisture. The dryer your hair the more it will frizz.
Personally, I like to use oils to moisturize because it's easier to work through thick hair. Some hair-friendly oils are argan, jojoba, coconut, sweet almond, macadamia nut and olive oil. You can also use those oils with other protein ingredients to make a deep conditioner to ensure the oils are absorbed into your hair. Depending on your hair type, some oils will work better than others. For instance, sweet almond works best for wavy hair as olive oil does for thick hair. From what I've seen argan oil is kind of the universal oil, it helps saturate all hair types similarly.
In addition to ensuring I moisturize more often, I bought a microfiber towel to dry my hair. This is supposed to absorb more water than a regular towel and reduce frizz that cotton towels create. If you wan to keep it simple, just use an old t-shirt. The t-shirt won't absorb as much water right away, but it will definitely help with the frizz.
