Moisture-activated heat generation converting sweat into warmth, certified +6°C temperature increase.
Amino acid moisturizing and skin-nourishing components (3660 mg/kg amino acids, 432000 ppr protein content).
Double-layer warm yarn for lightweight comfort without burden.
HydroDry instant moisture absorption fabric for rapid sweat conversion to heat, maintaining dry and warm skin feel.
Hollow fiber structure for long-lasting heat retention.
High warmth retention rate (≥31% heat generation).
Skin-friendly moisturizing barrier that resists washing degradation.
Breathability rating ≥554 mm/s with dual-layer yarn structure for fast moisture absorption and release.
Contains 65% regenerated fiber with longitudinal grooves for superior moisture absorption compared to cotton.
Four-way stretch fabric for unrestricted movement and comfortable fit.
Gender-specific design with expanded underarm area and smart waistband for comfort and fit.
Reinforced breathable crotch area for comfort.
High warmth models feature thickened collars for wind protection.
AAA-grade antibacterial fabric with 50 washes durability
89% antibacterial rate against E. coli
98% antibacterial rate against Staphylococcus aureus
80% antibacterial rate against Candida albicans
Seamless flatlock stitching to prevent skin abrasion.
Anti-static and anti-pilling grade 3 for long-lasting wear.
Machine washable with resistance to deformation, fading, snagging, and pilling.
Certified quality with third-party testing reports.
Stone Smoke Gray (Light Warm)
Dusk Black (Light Warm, Medium Warm, High Warm)
Additional details
Height 165-170 cm
M (55-60 kg), M (60-65 kg)
Height 170-175 cm
M, L, L, L/XL (varies by weight)
Height 175-180 cm
L, L, XL, XL, XXL
Height 180-185 cm
XL, XL, XXL, XXL, XXXL
Height 185-190 cm
XXL, XXL, XXXL
Similar size distribution as upper garments with M to XXXL options.
Sizes range from M to XXXL based on height and weight.
Sizes range from M to XXXL with reinforced features for extreme cold.
Amino acid and protein content verified pre- and post-wash.
Moisture-activated heat generation certified.
AAA-grade antibacterial efficacy confirmed by third-party labs.
Breathability and elasticity tests passed with high performance.
Thermal retention and durability tests conducted with positive results.
beneunder’s outdoor thermal underwear series offers scientifically certified, multi-functional thermal wear designed for men and women to provide optimal warmth, moisture management, skin comfort, and durability in varying cold weather conditions. The product line features advanced fabric technology, ergonomic design, and reliable antibacterial protection, making it ideal for autumn and winter outdoor activities.
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