Cake Bandit Jockstrap Aqua
Size 48 in jeans and bought a 3XL. Fit like a glove, which is hard to find in jockstraps at my size! The materials throughout are softer than I ever expected and the text is actually embroidered into the waistband (as opposed to screen printed which I honestly expected at that width and was pleasantly wrong) so the text is also very soft and will never rub off. There's no awkward pinching in your nether regions like some jocks do, too.
I am definitely going to buy another pair soon!