How to use: Simply put on this base layer as the first layer against your skin. It's designed to fit snugly, so it will work best when it's in close contact with your body. You can then wear your regular winter clothes over it. Note: Avoid sharp objects that could tear the fabric. If you're allergic to any of the materials (91% PP, 6% EA, 3% CF), don't use this product. Maintenance: Wash it in cold water with a mild detergent. Don't use bleach or fabric softeners as they might damage the carbon fiber and affect the odor - control properties. Hang it to dry to keep its shape and performance.