To use this Ireland 24 Elite First Layer, simply put it on as your base layer before your training session or casual wear. The VapoDri technology will keep you dry and cool by wicking away moisture. The 1/4 zip opening with a zip guard is easy to use and won't irritate your skin. When it comes to care, machine wash it in cold water with like colors. Avoid using bleach or fabric softeners as they may damage the fabric. You can tumble dry it and cool iron if needed, but don't dry clean it. This way, your first layer will stay in good condition for a long time.