India, Sept. 29 -- Something in the cold months makes people pay attention differently. Steam rising off a cup of tea. The hush right before sunrise. A jacket pulled tighter at the collar. Winter has a way of slowing everything down. Still, the air around us does the opposite, filling with smog, dust, and heater-generated dryness that hair absorbs all day long without anyone noticing.

Skincare usually gets the attention first once winter sets in. Moisturizers, lip balms, and thicker creams all appear the moment temperatures drop. Hair, meanwhile, keeps getting the same bottle it always has. "The same bottle from July sits in the shower well into December, while the air outside has turned into something noticeably harder on it", Hair expe...