$49.95 is a lot of bucks spent.
Years ago I've seen a few guy's use sea sponges (the natural one's about the size of a softball, not the oblong ones sold in regular stores ) when gripping a bar. Squeezing helped the grip they said....no doubt. Also guy's would double up on regular cooking pot holders and use those on the BB/DB's.
Those grips shown look something like baseball pitchers use for the different hand positions and improving the grip. Good Luck.