Is thermal underwear still warm after wearing it for a long time

Wearing thermal underwear for a long time will gradually weaken its insulation effect. The thermal performance of thermal underwear is mainly affected by factors such as material aging, washing method, and wearing frequency.

Thermal underwear usually uses special fiber structures or adds insulation materials to lock in heat. As the wearing time increases, the fibers will gradually deform due to friction and stretching, resulting in a decrease in the internal air layer. Air is the key medium for insulation, and when the fiber gap is compressed, the insulation performance naturally decreases. Frequent washing can also accelerate material loss, especially high-temperature washing and strong dehydration can damage fiber elasticity. The technology coating used in some thermal underwear may peel off after multiple washes, further reducing the insulation effect.

A few high-quality thermal underwear use durable materials and weaving techniques, such as hollow fibers or silver ion thermal storage technology, which can maintain good warmth even after long-term use. However, ordinary thermal underwear may experience significant thermal performance degradation after one season of use. Some consumers mistakenly equate pilling with insulation failure, but in reality, pilling mainly affects aesthetics and has a relatively limited impact on insulation performance.

It is recommended to avoid wearing the same thermal underwear continuously every day, and rotating the use can extend the lifespan of the clothing. Choose neutral detergent and water temperature below 30 degrees Celsius during washing to reduce mechanical friction. Keep dry and ventilated during storage to avoid fiber deformation caused by heavy pressure. If it is found that the thermal underwear has significantly become thinner or lost elasticity, it should be replaced in a timely manner to ensure the need for warmth in winter.