Disclosed is a thread combining multiple polymers. The thread consists of fibers of a first synthetic polymer of the Polyethylene terephthalate (PET) family and fibers of a second synthetic polymer of the Polyimide family, wherein the first fibers and the second fibers are combined together such that the resulting material, forming the thread, blocks photons with wavelengths falling within a first range of wavelengths and allows passage of photons with wavelengths falling within a second range of wavelengths. Photons whose wavelengths are within the second range of wavelengths, allowed to pass by the resulting material, may contribute to tanning of human skin.
