Sharpie Rub-A-Dub Laundry Marker

What is this?

A permanent marker specifically for clothing.

Why did I buy it?

I own multiple versions of several clothing items and I also track what I wear. I bought this marker so I could mark which versions of the clothing I was wearing to better rotate them and in general know which item I was using. 

It works well, but not perfectly. I found that writing on the tags typically resulted in a black mess after the first wash. You really need to find the best place to write on your clothes.