The Therm-ic Ultra Warm Performance S.E.T set combines thin heated socks with two S-Pack 4000B batteries in one box. The socks are made for experienced skiers with precisely fitting boots who value an accurate cut and a thinner knit. They sit firmly in the ski boot and give gentle warmth around the toes without compromising comfort.
Smart Elastic Technology (S.E.T) routes the heating system in one discreet line within an elastic seam, so the sock does not add bulk or dull the feel inside the boot. A thermoregulating knit with merino wool provides insulation and breathability, while polyamide keeps the sock in place and supports the foot during athletic effort. Moisture-Vent technology moves moisture away from the skin so your feet stay dry even during intense skiing.
The box includes two S-Pack 4000B batteries with Bluetooth support. You control the heating from your smartphone in the Heat Control App, and depending on the selected level the warmth lasts up to 20 hours (level 1), 8 hours (level 2) or 6 hours (level 3). A USB-C charging cable with two connectors is included for charging both batteries at the same time.
If you already own batteries and only need socks, take a look at the Therm-ic Ultra Warm Performance S.E.T heated socks without batteries. You can find more models in the socks category from Therm-ic, and our article on how to choose the right heated socks for winter activities may help too.
Remove the batteries before every wash.
Turn the socks inside out and wash by hand or in a washing bag at a maximum of 30 °C.
Choose a low spin speed, maximum 400 rpm.
Do not use bleach or fabric softener.
Do not tumble dry or dry on a heat source; dry the socks flat.
Recharge the batteries at least once every 6 months.
