Bundle - S-Pack 1400B Batteries + Ultra Warm Nordic S.E.T®

Stay warm, dry, and focused during your coldest Nordic ski sessions with this premium heated sock bundle, pairing the Ultra Warm Nordic S.E.T® socks with S-Pack 1400B Bluetooth batteries. Engineered for cross-country skiers and endurance athletes, this set delivers subtle, targeted warmth, breathable insulation, and a secure, low-bulk fit that won’t compromise boot feel or freedom of movement.

About the Socks – Ultra Warm Nordic S.E.T®

The Ultra Warm Nordic S.E.T® socks feature a thin, technical design specifically tailored for Nordic ski boots. Smart.Elastic.Technology® ensures a snug, adaptive fit that enhances comfort and connection without bunching or creating pressure points. A discreet 2 mm S.E.T® heating line delivers gentle, even warmth around the toes without impacting the natural fit or flex of the boot.

Made with a high percentage of merino wool, these socks provide excellent thermal insulation, breathability, and moisture regulation. Merino wool naturally balances temperature and humidity and can absorb up to 33% of its weight in moisture before feeling damp — making it ideal for long aerobic activity in cold conditions. Polyamide fibers reinforce the sock’s structure for durability, stretch, and reliable support. The knee-high length offers complete lower leg coverage for added protection against wind, snow, and cold.

About the Batteries – S-Pack 1400B

The S-Pack 1400B is Therm-ic’s most powerful battery, delivering up to 14 hours of heat through three manual settings or Bluetooth app control. Using the Therm-ic Heat Control app, you can fine-tune warmth on the go with a 10-level scale. App levels 3, 6, and 10 correspond exactly to manual settings 1, 2, and 3, giving you more adjustment flexibility without changing maximum heat output.

Lightweight and compact, the batteries clip securely to the top of the sock and recharge via the included USB cable. For optimal charging performance, a 5V/2A wall charger is required (not included). Built for long-distance skiing, racing, and touring in extreme cold, the S-Pack 1400B ensures reliable heat from start to finish.

Heating Duration

• Low: up to 14 hours
• Medium: up to 7 hours
• High: up to 3.5 hours

Key Features

• Thin, lightweight construction optimized for Nordic ski boots
• Smart.Elastic.Technology® ensures secure, low-bulk fit for performance skiing
• Discreet 2 mm S.E.T® heating element delivers targeted toe warmth
• Merino wool blend offers insulation, breathability, and moisture control
• Polyamide reinforcement provides durability, stretch, and foot support
• Knee-high length protects the entire lower leg from cold and wind
• S-Pack 1400B batteries provide up to 14 hours of Bluetooth-controlled heat
• Therm-ic Heat Control app allows precise, remote heat adjustments
• USB charging cable included; 5V/2A wall charger required (not included)

What’s Included

• 1 pair of Ultra Warm Nordic S.E.T® heated ski socks
• 2 × S-Pack 1400B batteries
• USB charging cable