What is the highest insulation rate for thermal underwear

The insulation rate of thermal underwear can reach over 90%, and the actual insulation effect is closely related to factors such as fabric material, filling thickness, and weaving process. It mainly includes far infrared heating fiber, multi-layer composite structure, aerogel interlayer, wool blending technology, nano thermal storage coating and other core technologies to improve the heat preservation rate.

1. Far infrared heating fibers

are made of ceramic particles or carbon fiber composite heating materials, which absorb the heat energy emitted by the human body and convert it into far-infrared radiation that is reflected back to the skin surface. This type of fabric has a thermal insulation rate of up to 85% in static environments, and can increase to over 90% due to frictional heating effects during dynamic activities. Be careful to avoid fiber breakage caused by friction with hard objects.

2. Multi layer composite structure

is designed by stacking three or more layers of different functional fabrics, with the outer layer being windproof and waterproof, the middle layer being temperature locked and heat stored, and the inner layer being moisture absorbing and breathable. Adopting three-dimensional cutting to reduce air convection, the insulation rate is generally maintained in the range of 80% -88%. The disadvantage is that wearing a larger size may affect the flexibility of movement.

3. Aerogel interlayer

takes nanometer silica aerogel as the thermal insulation layer, and its thermal conductivity is lower than that of static air. When used in conjunction with an aluminum film reflective layer, the insulation rate can exceed 95% in laboratory environments. However, in actual wear, the evaporation of human sweat can lead to a decrease in performance, and the insulation rate for daily use is about 75% -85%.

4. Wool Blending Technology

Merino wool is blended with synthetic fibers such as acrylic and spandex, utilizing the natural hollow structure of wool to store a static air layer. Under standard testing conditions, the insulation rate is about 78% -83%, which has the advantage of strong humidity regulation ability and is suitable for wearing in environments with large temperature differences.

5. Nano thermal storage coating

is coated with phase change microcapsule material on the inner side of the fabric, which absorbs or releases heat through the process of material phase change. This type of technology can maintain a constant temperature effect of underwear in an environment of 15-25 ℃, with a maximum insulation rate of about 82% in extreme low temperature environments, but the coating may peel off after multiple washes.

When selecting thermal underwear, it is recommended to match different technical products according to the use scenario. Aerosol gel or far-infrared can be selected for cold outdoor activities. It is suitable for wool blend or multi-layer structure for daily commuting. Pay attention to the thermal resistance value (Clo) label of the product. A value above 0.5Clo can meet the requirement of minus 10 ℃. Avoid high temperature drying and strong rubbing during cleaning, and ensure complete drying before storage to prevent fiber clumping from affecting insulation performance. People with special physical conditions need to test the skin friendliness of the fabric to prevent static electricity or allergies.