Our products are mixed with Copper yarn strands with the organic materials like Cotton, Bamboo, Hemp or other organic materials so it cannot wash off like infused/Sprayed on Copper. Other products claiming Copper, are using Spray coated Copper and it will wash off in just a few washes which we leave the Front-Line worker unprotected. Swiss Precision mantra for our products is to help as much as possible to give back to the world ECO system, we will use organic materials in products where we can, like Organic Cotton, Bamboo, Hemp, and Cotton/Linen combinations to cut down on the oil based materials.