Abstract
To develop heat–moisture adaptive elastic seamless sports underwear, polybutylene terephthalate (PBT)/polyester (PET) yarn was used as base yarn, and hydrophilic polyester (HPET)/PET was used as face yarn. Polyurethane (PU)/polyamide (PA) covered yarn, nylon, and polyester were used as control samples. Nine fabric samples were fabricated on an SM8-TOP2 MP2 seamless knitting machine, and their thermal–wet comfort (air permeability, moisture permeability, liquid water management, and thermal resistance) and elastic recovery were systematically evaluated. Orthogonal experiments and fuzzy mathematics comprehensive analysis showed that PBT/PET and HPET/PET fabrics were clearly better than PU/PA and polyester, exhibiting 348.93% higher air permeability, 128.29% improved moisture permeability, and 73.33% enhanced overall moisture management capacity. Notably, Sample 8 (PBT/PET base yarn, HPET/PET face yarn, 3 + 9 interlaced structure) demonstrated optimal comprehensive performance, achieving heat–moisture self-adaptation through dynamic pore adjustment under varying humidity and temperature conditions. These findings provide a technical foundation for designing intelligent sportswear that balances thermoregulation, moisture control, and elastic comfort.
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