I sent a pic of the first picture (see above) to a friend. Hmmmm. I think it looks a bit easy to get out of - typical Brazilians - always wanting to play when they are supposed to be secure. But look, it does come with five sizing rings and they even have different colors to choose from.
Now, if you are quite large, they make the monster version in an appealing array of colors. Man I wish I could fit into that thing. :)
But if you are like most of us, it comes in a standard 2 or 3" molded plastic design that is the envy of all at CB6000 and similar companies.