The RefrigiWear Heavyweight Mid-Layer Thermal Top adds 7-15degree(s)F of extra warmth, making it the perfect winter base layer for cold or industrial environments. Made from a 92% polyester and 8% spandex 4-way stretch blend with 240g fabric, it moves with you while locking in heat. A raised crew neck, brushed lining, and flat seams enhance comfort and protection. Available in sizes S-4XL, this durable thermal top helps you stay warm, focused, and ready to tackle tough jobs in freezing conditions.