The Thermo inlay sole from Brynje is a heat and cold insulating felt inlay sole with an insulating foil on the backside. It is suitable for work in extreme temperatures, freezing houses or asphalt work, where the inlay sole insulates and protects the foot from the harsh temperatures. A breathable, durable inlay sole, that can be applied universally to Brynje footwear. Use the cutting lines on the backside, or use the existing inlay sole as template for optimal fit.