When selecting thermal underwear, consider the material, as it significantly affects insulation, moisture-wicking ability, and care requirements. Common options include cotton, wool, synthetic, and silk.
Cotton thermal underwear is the most affordable, suitable for low-activity situations, but not ideal for sweat-heavy activities due to its high moisture absorption.
Wool is a natural option that excels in insulation and moisture management, making it ideal for lower temperatures; however, it may irritate the skin unless it's merino wool.
Synthetic thermal underwear blends materials like polyester and nylon for moisture-wicking and insulation; it's durable and dries quickly, balancing affordability and effectiveness well.
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