A cold front is set to sweep into Hong Kong on Sunday, with temperatures expected to plunge from 22 degrees Celsius on Saturday to just 15 degrees on Sunday. As the weather cools, many people will start reaching for their thermal underwear — but staying warm isn’t just about putting them on.
Whether you already rely on thermals or plan to buy a new set, avoiding a few common mistakes can make a big difference in keeping the winter chill at bay.
Mistake 1: Skipping the wash
Some believe thermal underwear should be worn repeatedly without washing, fearing that cleaning will weaken its insulating power. In reality, this is a myth.
Consumer Council tests have found that most thermal products maintain — and sometimes even improve — their heat retention after 30 washes. Regular cleaning is not only hygienic but also helps the fabric perform at its best.
Mistake 2: Washing in hot water
Very hot water can damage the fibers in thermal wear. Experts recommend keeping wash temperatures below 40 degrees Celsius, using gentle cycles or handwashing.
A laundry bag can help prevent stretching, while special detergents, dry cleaning and tumble drying should be avoided to protect the garment’s function.
Mistake 3: Drying under direct sunlight
Sunlight may seem like the quickest way to dry clothes, but for thermals, it can be harmful. Direct exposure can weaken the fibers. Instead, place them in a cool, well-ventilated area to air dry naturally.
Mistake 4: Wearing thermals during workouts
Thermal fabrics aren’t designed for heavy sweating. Because they don’t absorb much moisture, wearing them during exercise can actually make you feel colder — especially when sweat interferes with the garment’s ability to generate heat.
Mistake 5: Layering too much over thermals
Thermals work by absorbing moisture from the skin and converting it into heat. If they don’t sit close enough to the body, this process becomes less effective. Wearing multiple layers over them can also reduce their warming function.
Mistake 6: Ignoring the “expiry date”
Like all clothing, thermal underwear wears down over time. Frequent washing can reduce its insulating ability. UNIQLO recommends replacing thermals every three years for optimal performance. Checking the tag for the production date can be a helpful guide.
Mistake 7: Choosing a size too big
Many people size up in fear of shrinkage, but loose-fitting thermals won’t trap heat efficiently. For the best warmth, choose a snug fit that stays close to the skin.
With temperatures dipping and winter settling in, a little attention to how you care for and wear your thermal underwear can keep you much warmer — and much more comfortable — throughout the colder months.
