Hotronic Bootdoc Thermo X Mid Arch Insole Grey/Blue, 24.0

What Our Gearhead(R) Experts Are Saying: "I use the Thermo X Mid insoles in my touring boots. The Merino top keeps my feet warm without sweating, and the moderate arch support really helps on long approaches and technical descents."When the temperature drops, we need every layer to pull its weight, including what's underfoot. The BootDoc Thermo X insole is designed to support all three arches of the foot while keeping things warm, dry, and stable with a merino wool top cover and structured mid-foot design. It's the sweet spot of comfort, insulation, and support for skiers and riders who push through cold conditions. This model features a rear foot stabilizer to reduce fatigue and keep movement efficient, while heel cushioning softens impact on bootpack descents or bumpy lift laps. With targeted support for mid-arch foot types, this insole fits seamlessly into ski, snowboard, and winter work boots, helping us stay warm, aligned, and ready for more.