Q: Do the socks come with a battery?

A: No. The socks are powered by any standard USB 5V/2A power bank (not included). This design choice is deliberate — it lets you use the power bank you already own, avoids proprietary battery lock-in, and means you can swap in a fresh bank for extended runtime. A 10,000mAh power bank provides approximately 4–6 hours of heat at medium setting.

Q: Can I machine wash these socks?

A: Yes. Disconnect the USB power cable from the sock controller before washing. Machine wash cold on a gentle cycle. Do not bleach. Air dry only — do not tumble dry, as high heat can damage the internal heating elements. The woven-in element construction is designed to withstand repeated washing cycles without degradation.

Q: Are they safe to wear for extended periods?

A: Yes. The heating elements operate at low voltage (5V DC from USB) and are fully insulated within the fabric structure. The three temperature levels let you adjust from gentle warmth to active heating. The elements are regulated to prevent overheating, and the cotton-rich fabric provides natural insulation that distributes heat evenly. As with any heated garment, users with reduced thermal sensitivity should consult a physician before use.

Q: Will these fit inside ski boots?

A: Yes — this is one of the primary design considerations. The thin-profile heating elements add less than 1mm of thickness to the sock, and the elastic cuff stays in place without bunching. The reinforced toe and heel prevent wear from boot friction. Choose your normal sock size; the heating elements do not affect the fit.

Q: How do I know which temperature setting to use?

A: Press the side-mounted controller button to cycle through: Off → Low (red LED) → Medium (blue LED) → High (green LED). Start on Low in mild cold (0–5°C / 32–41°F), Medium for active winter sports (-5–0°C / 23–32°F), and High for stationary activities in deep cold (below -5°C / 23°F). The LED color indicates the current setting at a glance.

Q: What if one heating zone stops working?

A: Each zone operates on its own circuit. If one zone fails, the other two continue functioning normally. Check the USB cable connection first — loose connections are the most common cause of zone failures. If the issue persists, the socks are covered by manufacturer warranty. Contact support with your order details for a replacement pair.

Q: Can I wear these with regular shoes, not just winter boots?

A: Absolutely. The socks are standard thickness and fit comfortably inside sneakers, casual shoes, or work boots. The heating elements are thin enough that you will not feel them through the sole of a regular shoe. Many users wear them for cold-weather commuting in regular footwear with a slim power bank in their pocket.