This Butt Protector is designed with the convenience of a traditional Butt Protector but with the support of a t-bar or harness. Its 100% EVA foam with UV Inhibitors. carefully designed and tested. Use from big striped bass and tuna in the northeast to big snapper and sailfish down south. Works with any rod without a weird shaped butt cap. Tested on over 200 rods and fit all but 2. This has a plastic insert in the end to prevent a sharp metal rod butt from tearing through it.