Sub Zero Meraklon Thermal Balaclavas are manufactured from a light polypropylene fibre that also benefits from having incredibly good wicking properties & has the lowest thermal conductivity of any traditional thermal clothing fibre. Due to its chemical construction, polypropylene fibre does not absorb moisture or react to/degrade when in contact with ordinary chemicals or acidic sweat. Polypropylene thermals are soft, durable, color fast & resist fading.*PLEASE NOTE: This garment is sub-standard & may have a fabric fault such as a pull, a dye/dirty mark, or a manufacture fault such as a missed stitch. Apart from that the product is produced exactly the same & will perform just as well as a first quality garment.