SEPTWOLVES Men's Thermal Underwear Autumn Winter Fleece Lined Far Infrared Heating Mid-High Neck Base Layer Top (Increases Temperature by 9.7°C)

Aerogel thermal fiber technology developed by Raretech Ltd.

Aerogel is a nano-porous solid material with ultra-low density (~3 mg/cm³) and excellent insulation properties.

Aerogel insulation equivalent to 20-30 layers of ordinary glass per inch thickness.

Provides continuous and uniform warmth, blocking cold air infiltration.

Certified testing for far-infrared and solar heating performance (GB/T 30127-2013, GB/T 18319-2019).

Solar heating effect raises temperature by up to 9.7°C.

High-density fleece lining for extended winter warmth, soft and skin-friendly without bulkiness.

Height and weight reference chart provided for optimal fit.

Measurements may vary slightly; customers should choose size based on personal preference.

Durable ribbed collar resistant to deformation.

Half-high collar design for wind protection.

Stylish slant line design suitable for outerwear.

Unique cuffs for trendy appearance.

Flat seams for comfort without irritation.

Precision stitching for aesthetic and comfortable fit.

Aerogel technology originally developed by NASA in 1931 for aerospace insulation.

Aerogel known as "frozen smoke" due to its translucent, ultra-light structure.

Product tested and certified by authorized quality inspection agencies (CMA certificates provided).

Suitable for cold climates, providing lightweight yet effective thermal insulation.

Available for viewing on models to showcase fit and style.