What Far Infrared Actually Is?
Far infrared (FIR) is a natural part of the infrared spectrum. The human body continuously emits infrared energy as heat, with a strong emission peak around 9.3–9.4 μm.
FIR textiles are designed to interact with that body-generated heat and reflect part of it back toward the wearer within the 4–14 μm range. This is a passive process rather than an external heat source.
What Research Supports?
Research on FIR textiles has reported effects such as:
- Improved local microcirculation
- Modest increases in skin temperature
- Support for post-exercise muscle recovery
- Improved wearing comfort
FIR clothing should be positioned as a supportive functional textile, not as a medical treatment or cure.
Why Manufacturing Method Matters?
Not all infrared fabrics use the same construction.
Surface-coated FIR fabric applies functional minerals onto finished fabric, while yarn-infused FIR technology integrates the minerals directly into the fiber during spinning.
The second approach is designed to provide better durability because the functional material becomes part of the yarn structure rather than remaining only on the surface.
How Hitek SiTEX® Works?
Hitek Textile’s SiTEX® FIR yarn uses a patented dual-core spinning process that integrates more than 20 natural minerals directly into the yarn structure.
According to the supplied content, SiTEX® is designed to:
- Operate across the core 4–14 μm FIR reference band
- Extend spectral coverage up to 16 μm
- Provide FIR reflectivity measured at up to 95%
- Maintain function through fiber-level mineral integration
