Climashield® APEX provides unmatched lightweight warmth. It combines hundreds of thousands of continuous strands of synthetic fibers, forming a unique interlocking solution that doesn't wear out and maintains maximum warmth throughout the life of the product no matter how many times the garment or sleeping bag is stretched, washed, or packed. Climashield ® is a unique and proprietary technology that delivers warmth, even in wet and humid outdoor conditions. Choose from various weights such as 2.5 oz., 3.6 oz., 5 oz., or 10 oz, among others. Climashield ® is manufactured in Clinton, TN.