To use these Condor Merino Arm Warmers, simply slip them on your arms. They're great for cycling, running, or any outdoor activity on cooler days. When it comes to maintenance, wash them at 30 degrees. It's best to use non - biological detergent, merino cleaner, or wool detergent. Avoid tumble - drying them to keep the fabric in good condition. You can give them a cool iron (one dot) if needed. Enjoy the warmth and comfort these arm warmers bring to your outdoor adventures!