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A thermal inner layer is a garment designed to trap and retain body heat, providing insulation and warmth in cold weather conditions. These garments are typically made from materials like fleece, wool, or synthetic fibers that have excellent heat-trapping properties. Thermal inners are often worn as a base layer beneath other clothing items, creating a warm microclimate against the skin. They are popular for activities such as hiking, camping, skiing, and everyday wear in cold climates, as they offer effective insulation without adding bulk.