If you’ve ever stepped out of the shower feeling like your conditioner just sat there, you already know the frustration of low-porosity hair. You deep-conditioned, waited the full 20 minutes, and your curls still feel dry and a little waxy. Now toss fall into the mix: cooler air, lower humidity, and the season’s first blast of indoor heat can make your hair routine feel like it’s fighting you. But is it your routine, or is it your products? The honest answer is a little of both. It comes down to how your hair cuticle behaves once the seasons shift, and whether your products are built to...