Regarding marking on ULTRA-SAFE, INC. harness other than the tag that is put on during the manufacturing process. It is ok to use marking pens from SANFORD, INC. on Ultra-Safe, Inc. harness they use a type of permanent ink that will not cause deterioration to nylon and polyester webbing. This is the only brand that is approved for marking. If you have any questions about marking your ULTRA-SAFE harness, you can reach me at (800) 850- 5914.
Note: brand Sanford, Inc, “Sharpie” felt-tip