How to use: Simply put on this long-sleeve T-shirt as an extra layer under your protective outerwear. It's suitable for workers in oil, gas, utility, construction, and industrial jobs. Attention: Make sure to follow the washing instructions to maintain its protective function. Although it can withstand 100 home washes or 50 commercial laundry cycles, over - washing may affect its performance. Maintenance: Wash it according to the normal washing cycle at home or use a commercial laundry service. Avoid using harsh chemicals that may damage the flame - resistant properties. Check the shirt regularly for any signs of wear and tear, and replace it if necessary.