3 Gear Temperature Control and Temperature Locking: This Rechargeable Heating Socks has 3 gear of temperature control settings. Short click the power switch button to turn to the 3 levels (the red light is about 60 , the white light is about 50 , and the blue light is about 45 ). It is made in windproof, water repellent, breathable, and temperature locking fabric. We recommend to adjust it to a high setting 20 minutes before use, and then change it to a low temperature 5 Seconds Full Foot Fast Heating Socks: This Heated Socks features a 360 full coverage surround heating design, composite carbon fiber, and far-infrared heating technology, which can evenly transmit heat to every inch of the foot's skin in 5 seconds, resulting in faster heating and stronger heat resistance Rechargeable Battery Heating Socks: This Electric Heating Socks includes a pair of 3.7V 2000mA rechargeable batteries, USB port, suitable for most mobile phone power banks, a hidden power bank pocket design, with a closure button to help better secure the power bank and prevent it from falling out even during exercise Fashion Plaid Contrast Color Design: This Heated Socks for Men Women features a classic fashion plaid design with black and white stripes and orange plaid contrast color design, which is fashionable and warm. Our heated socks are designed in the average size suitable for most adults, both men and women High Quality Skin Friendly Material: Our Heated Socks are made of machine washable and hand washable Modal material, which is non pilling, non shedding, skin friendly and comfortable with high elasticity, and does not deform when pulled. It is in fine and seamless sewing and edging process. Remove the battery and charging cable before cleaning to avoid breaking the wires when using the washing machine