One size fits all. Charge, clip on, pull them on.

No size chart to work out and nothing to trim. The knit stretches to fit most adult feet, and the heating is built into the sock itself, so there's nothing to slide in or line up. Each sock takes its own battery, and both come in the box.

1. Charge both batteries. The 1-to-2 cable charges both 3,000 mAh batteries at once from a single USB plug. Charge them fully before you wear the socks for the first time.
2. Connect a battery to each sock. Plug the connector into the battery, then slide the battery into the pocket at the top of the sock. Make sure each battery sits flat in its pocket before you put your boot on, so nothing presses into your calf.
3. Pull them on and set your heat. Press the button to cycle through Low, Medium and High. The LED indicator lights tell you which setting you're on — one light for Low, two for Medium, three for High.

Wearing them with boots? Pull the sock all the way up so the battery pocket sits above your boot line. That keeps the battery out of the way and lets you change the heat without taking your boot off.

Cold feet end the day early. That is the whole problem.

Thick socks only trap the heat you're already making, and once your toes go numb, two pairs won't bring them back — they just make your boots tight. We built these around the three things that actually go wrong.

• Heat you can't feel through the sock. The heating system is built in seamlessly, so there are no lumps, no ridges and no wires digging in. Warmth spreads evenly instead of sitting in one hot spot.
• Warmth that stays safe. A BMS power management system monitors the temperature in real time and holds the heat in a safe, comfortable range. Warm like sitting in the sun, not a hot patch you have to keep switching off.
• Heat that outlasts the day. Built for the coldest days, with 12+ hours of warmth on Low from a battery in each sock. Early starts, long shifts and dark walks home, without the heat running out halfway through.
• Socks that still move like socks. They stretch and bend with your feet, so you can walk, work and ski in them without feeling like you're wearing equipment.

Built in layers for safety. A PVC leakage protection layer, a flame-retardant surface layer and a PVC heating wire protection layer sit between you and the heating element.

What are they made of?

• Soft, breathable cotton — thickened for insulation and gentle enough for sensitive skin
• Seamless built-in heating — invisible from the outside, with no seams or wires pressing against your foot
• Multi-layer protection — PVC leakage protection, a flame-retardant surface layer and a PVC heating wire protection layer

One size fits all. The knit stretches and bends with your feet, so they fit most adult feet and you keep full movement through a day of winter activity.

How do I care for them?

• Remove the batteries first. Always unplug and take out both batteries before washing.
• Hand-wash in cold water. Use a mild detergent. Don't wring or twist them.
• Lay flat to dry. Air-dry completely before you reconnect the batteries.
• No tumble dryer, iron, bleach or dry cleaning. All four damage the internal heating elements.

What's in the box

• 2 × HearthFoot™ Heated Socks
• 2 × 3,000 mAh polymer batteries
• 1 × 1-to-2 charging data cable
• 1 × gift box packaging

They arrive in gift box packaging, so there's nothing to wrap if you're buying them for someone else.

Between seasons. Store them flat and dry with the batteries disconnected. See the Battery & Heat Settings tab for how to look after the batteries while they're stored.

12+ hours of heat, from a battery in each sock.

Both 3,000 mAh polymer batteries are included. On Low you get 12+ hours, enough for a full day out and the journey home. Medium and High are warmer and use the charge faster.

Charging

• Both at once. The 1-to-2 charging data cable fills both batteries from a single USB plug.
• Charge before first use. Give both batteries a full charge before you wear the socks.

Reading the lights

• Press the button to cycle through Low, Medium and High.
• Count the lights. One is Low at 40°C, two is Medium at 45°C, three is High at 50°C.
• The BMS does the rest. It monitors the temperature in real time and keeps it in a safe range.

Battery care

Putting them away for summer? Charge the batteries to about half, then top them up every couple of months so they stay healthy.

Charge them overnight. Plug both in when you take your boots off. They're full by morning and ready for the whole day.