I would advice you to be bit cautious with Aarding. Their sheets will ground you only maximum of couple of weeks or months. They try to claim that there is nothing wrong with their products and the washing detergent I have used (Thieves - all natural) is not suitable for their sheets because it has bleach in it. That is not true. It has no bleach/peroxides in it. It is totally suitable for colored clothes. Ludo hadn't tested or anything he just assumed that there must have been bleach element present. There is none. I get the feeling that Aarding is trying to bury or cover up a biger problem they have with their products, which is that the products are not durable and lasts only few weeks or at most couple of months. I do not know but they might rely on that most people do not have the body voltage meter or if they have they will only test the product when it arrives. In the beginnen the products works just fine but now after 6 months when I tested again the grounding effect was zero in both the sheet and the grounding mat. The grounding mat has never even been washed or anything and it too had totally lost its grounding effect in 6 months. Aarding did not have any other comment than "it is highly unusual". Nothing like send it back and we take a look or we will refund it - nothing. So my advice to you is that if you want to have products that are durable and work even the minimum of a guarantee period (12 months) and the provider is straightforward and willing to take responsibility of their products and promises, you should turn somewhere else.