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Children's functional underwear: The Swix RACE X were developed and tested by athletes and over the years they have become popular not only because of their elastic structure, but mainly because of the ultra-lightweight material. The open ribbed structure actively uses and maintains the insulated air inside, but is also highly breathable, so there is no risk of overheating. Although the fibres used are hydrophobic and quick-drying, the structure of the material absorbs sweat and moisture from your skin and it has excellent thermoregulatory properties.