Thin, close-fitting inserts worn inside gloves or mittens provide an additional layer of insulation against low temperatures. These inserts are often constructed from materials like silk, wool, or fleece, which trap warm air close to the skin. A common example would be a pair of lightweight merino wool inserts worn inside ski gloves.
Supplemental insulation for handwear significantly enhances comfort and protection in frigid environments. This extra layer helps to regulate hand temperature, preventing discomfort, numbness, and even cold-related injuries like frostnip or frostbite. Historically, layering for warmth has been a practical necessity in cold climates, and the principle extends to hand protection. Modern materials and manufacturing techniques have led to highly effective and comfortable options for enhanced warmth.