The Super Tacks tailbone padding is much better than 9K tailbone padding imo, it covers more area to the sides with segmented parts and extends farther downwards. I have not tried other pro stock options but have had Coopers back in the 90's, Tackla, and Easton and had a Bauer wrap style for a little bit that I hated (I prefer more traditional step in girdles or the CCM hybrid style like the 9K/ST). Overall I find the ST girdle more protective than the 9K was and it's lighter, it's a win-win for me.