【Spring Temperature Swings】 The Science of Fabrics and Air That Helps Regulate Your Autonomic Nervous System
Although the calendar says spring has arrived, March is known in Japan for its dramatic temperature swings—often described as “three cold days followed by four warm ones.” Morning temperatures can drop below 5°C, while daytime highs may approach 20°C.
Faced with these rapid changes, our bodies are constantly working to maintain a stable core temperature. This continuous adjustment places strain on the autonomic nervous system, contributing to the fatigue and sluggishness many people experience in spring.
In this article, we explore—through a scientific lens—how the right material can help reduce this “temperature gap stress.”
1. Merino Wool as “Wearable Insulation”
We feel cold or heat when surrounding air either steals warmth from our skin or adds heat to it. The key to stabilizing the autonomic nervous system lies in keeping the “microclimate” (the space between skin and clothing) as consistent as possible.
Wool fibers have a unique natural crimp not found in cotton or polyester. This crimp traps large volumes of air between fibers, forming a natural insulating layer that shields the body from external temperature changes.
▼ Comparison of Thermal Conductivity by Material (Lower values indicate better insulation)
*Illustrative comparison based on typical thermal conductivity and thermal resistance values. Merino wool can contain up to 80% air within its fiber structure, making it highly resistant to rapid temperature transfer from the environment.
2. How Humidity Disrupts Perceived Temperature
Another hidden challenge of spring temperature swings is humidity. Even a small amount of perspiration—such as in a crowded train or office—can evaporate and draw heat away from the skin, causing a sudden chill known as “sweat cooling.”
Merino wool absorbs moisture in the form of water vapor and releases heat through a process known as heat of sorption. As a result, the skin stays dry while rapid cooling is prevented—an essential difference from synthetic or cotton innerwear that simply traps moisture.
| Comparison | C-one Merino Wool | Typical Synthetic / Cotton |
|---|---|---|
| Thermoregulation | ◎ Adapts to ambient temperature | △ Easily affected by surroundings |
| Moisture Management | ◎ Absorbs vapor and generates heat | × Feels damp and cools quickly |
| Comfort on Skin | ◎ Maintains stable warmth | △ Often too hot or too cold |
3. Comfort That Even the Brain Recognizes
Another key to regulating the autonomic nervous system lies in harmony between sight and touch. The Super 100's merino wool used by C-one (18.5 microns or finer) offers a smoothness comparable to cashmere. This gentle texture sends calming signals to the brain, easing tension throughout the day.
Choosing silhouettes and colors that truly suit you is also known to enhance self-confidence and emotional stability through increased serotonin levels. Comfort is not only functional—it is sensory and psychological. This is C-one’s approach to living well in spring.
This Spring, Choose the One Piece That Balances You.
Materials that respect your nervous system—paired with colors and shapes made for you. Complete our free diagnosis to receive a personalized recommendation and a 10% OFF coupon.
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