Three levels of adjustment for comfort and ease of use, adjusting to different temperatures as required, low 40C, mid 45C, high 50C. Nanocomposite fibre heating wire for fast heating, about dozens of fine wire to form a soft as silk hair Invisible technology, built-in non-marking heating system, through the innovative invisible knitting process, abandoning the traditional practice of sewing heaters on the socks, socks are more beautiful, more comfortable, more uniform heating and warmth, the practicality of the overall improvement High elasticity & high stretch, double thickened and padded, we have achieved high stretch from the sole length, toe width, sock tube length, sock opening width, multi-dimensional, no longer afraid of the size of foreign feet, tall, short, fat, thin, men and women can wear The battery is removed and the power connector is waterproof. Batteries are not included, so bring your own