As the cold season ends and we fold away our favorite wool jumpers and silk scarves, some fascinating material science is about to unfold quietly in our wardrobes.

Subtle chemical and biological processes will decide whether our clothes stay as cozy as ever or emerge next winter yellowed, brittle, and ridden with holes.

Some of our favorite winter garments, made from natural fibers such as wool and silk, feel soft or luxurious – but they are far from inert. At the molecular level, these fibers are protein-rich structures that interact constantly with the environment.

These complex structures are what make the fibers comfortable to wear, and also what make them vulnerable to storage conditions.

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