For labelling on polyester (e.g. football shirts) we recommend the edding 8040 laundry marker, available in black and red.
We can’t make a general recommendation for writing or designing on mixed fabrics, but for a wash-resistant result we suggest the edding 4500 textile marker and the edding 4600 textile pen which are offered in a very wide colour palette for light-coloured textiles – ideal for many mixed fabrics. However, you should test the products on an inconspicuous area first to ensure that you’ll be satisfied with the end result.