Therm-ic

Heat Fusion Sock

What Our Gearhead® Experts Are Saying:

"These heated socks have been a game changer for my winter backcountry days. The toe heat is evenly distributed and keeps my feet from freezing on slow ascents or while standing still. They fit well in my boots, and the merino blend stays dry and comfortable even without the battery running."

When the cold starts biting, we reach for the Therm-ic Heat Fusion Sock Outdoor to keep our feet warm and ready for hours of mountain adventure. Designed to be used with Therm-ic’s S-PACK battery system (sold separately), these high-performance socks deliver targeted warmth around the toes—where it matters most in deep winter conditions.

Built from a Merino-ic blend, the socks combine soft, moisture-wicking merino wool with durable, insulating synthetic fibers. Snap fasteners allow quick battery attachment, while reinforced heels and toes ensure comfort and durability for hiking, snowshoeing, and ski touring. Whether we're trekking into alpine terrain or staying out through the storm, the Heat Fusion Socks keep us going longer—and warmer.