Bumble and bumble Bb. Curl (Style) Anti-Humidity Gel-Oil
While I do use this Bumble and bumble Bb. Curl (Style) Anti-Humidity Gel-Oil ($30) year-round, it's essential in my summer routine. It's got a blend of babassu, brazil nut, and pracaxi oils along with cupuacu butter that all deeply hydrate my hair (and lock that moisture in), but its gel-like texture also defines and holds curls even in the hottest weather.