**Product Specifications:**

**Brand:** Hengyuanxiang

**Material:** 99% pure wool

**Features:** Provides ample warmth and comfort, wool knee and waist warmers

**Technology:** Natural wool with air-trapping curly fibers for enhanced insulation

**Certifications:** Tested and approved by authoritative institutions such as TITS and National Textile Inspection and Testing Center

**Warmth Level:** Suitable for temperatures ranging from -20°C to 5°C

**Layer Structure:** Four-layer design with 99% pure wool filling for optimal warmth

**Variants:** Standard, thickened, and graphene versions available

**Design:** Button-up front closure, elastic waistband, windproof ankle cuffs

**Sizes:** Available in 170/175/180/185/190

**Color Options:** Black, charcoal

**Composition:** Varies based on the version (standard, thickened, graphene)

**Additional Features:** Skin-friendly, durable color, convenient front closure, comfortable elastic waistband, windproof ankle cuffs

*Note: The above data is provided by the National Textile Product Quality Inspection and Testing Center and is subject to minor variations due to different fabric batches. For reference purposes only.*

Choose Hengyuanxiang for authentic wool innerwear that offers superior warmth and comfort.