Premium Features: ① Cloud-Like Fleece Interior Ultra-plush 3mm pile lining Thermal insulation retains 95% body heat ② Lycra® Enhanced Comfort 360° stretch technology Maintains elasticity after 30+ washes ③ Seamless Toe Construction 0.3mm flat-lock stitching Eliminates pressure points ④ Anatomic Heel Design 80° ergonomic contour Anti-slip silicone dots (invisible) Winter-Ready Benefits: ❄️ Keeps feet warm at -10°C ❄️ Moisture-wicking properties ❄️ Machine washable at 30°C