Personally, I'm not a big fan of those swimple goggles for competitive swimming.
What I've actually seen as being the most universally-fitting goggles are the women's vanquishers. They seem to fit, kids, adults, men, women, etc. without a problem.
Jr. vs. adults is a hard question, because they can vary sooo much from style to style. Some goggles (like the hydrospex by Speedo) actually come in Adult, Jr.'s, AND kids.
But again, as a coach and someone who works in a swim store, I can give my #1 recommendation as the women's vanquishers.
Maybe you can ask some of his friends/teammates to try their goggles on to see which fit him best?
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