Ta Ta towel or something similar?

My girlfriend has very large breasts and constantly is having under boob irritation, sweating, and of course tons of back problems. For context, I have 38 Cs, so not huge but not super small either. Her size is a 42 H and she’s constantly in pain either from their chaffing or the weight on her back. I’m looking for something to help her take some of the load off and found the “TaTa Towel.” Do any of you have experience with this or is it just some other silly fad thing that doesn’t actually account for women with large breasts.