Opened for inspection, but actually unused. I am selling the latest 2025 model heated socks (black, standard size). Made of 90% cotton and 10% nylon for excellent breathability. This is an improved version that warms the toes, soles, and instep 360° for a continuous, soft warmth like a kotatsu. **■ Four Key Features** ① **Easy Smartphone Control**: Adjust temperature (4 levels from 40℃ to 70℃) and set timers with the dedicated app. Easy to operate even in bed! ② **Easy to Wash Design**: Both washing machine and dryer are okay (*always remove the rechargeable battery before washing). The thick toe area prevents fatigue even during long walks. ③ **Includes 2 PSE Certified Rechargeable Batteries**: 8500mAh x 2 with a maximum operating time of 10 hours. Type-C charging is compatible with smartphone cables. ④ **Unisex Fit**: Fits shoe sizes 23-27cm. The battery storage pocket has a non-slip finish to prevent it from shifting while walking. **■ Main Uses** Perfect for commuting and outdoor activities (skiing/fishing), as well as for cold sensitivity relief and as a gift for the elderly. App connectivity allows for timer heating during sleep. **【Notes】** * This is not a medical device. Discontinue use if any skin abnormalities occur. * For initial defects (heating failure, charging failure), please contact us via transaction message within 7 days of arrival. We will accept returns (return shipping costs will be borne by the buyer). * Always remove the rechargeable battery and use the included laundry bag when washing. Selling new and unused items at a special price due to inventory clearance. A product that warms your feet and your heart this winter. Please feel free to ask any questions before purchasing. I strive for smooth transactions.