The seasons stress your hair in different ways, and each one only needs a small adjustment. Nothing drastic.

At the sea, it's the salt. It pulls moisture out of your hair, even though your scalp usually copes with it fine, so the main thing is not to let it dry in. Before you swim, wet your hair with fresh water first, then work in a mask and a good sun protectant. After, rinse it out with fresh water, mask again, and top up the protection. If you'd rather keep it simple, a high bun that stays clear of the splashes does a lot on its own. Between beach days, a chelating shampoo now and then lifts the salt that's built up.

Pools are their own thing, since you're in and out of the water a lot and under a cap for ages. The chlorine dries your hair, the rubber cap tugs at it, and locker-room dryers aren't kind. Before you get in, wash with a mild shampoo you can use often, add a mask, rinse well, tie the length back softly, and cap up. After, rinse it properly, add heat protection, and dry on a cool setting.

Cold is slower, but it's real. Winter air is dry, and dry air draws the moisture out and leaves hair more brittle, so it breaks more easily. The fix is to keep it covered and well conditioned: a hat, nourishing masks, and richer creams and oils in place of light sprays.

Dry indoor air from the heating adds to it, and you feel it as static. Static is mostly just dry air, so when your hair lifts and clings, reach for moisture and a richer cream, and go easy on the spray.

Through the seasons, keep a steady base that suits your hair and adjust around it: lipids against dryness, moisture kept in even through winter, sun protection in summer. One small winter habit to keep: get any leave-in on about ten or fifteen minutes before you go out, so it settles in before the cold does. A humidifier at home helps with the dry indoor air, too.