Happy World Oceans Day! In celebration of this official United Nations holiday, I'm giving away   a ‘Save Your Oceans’ organic T-shirt from Nautica to one lucky MNN reader!

These men’s T-shirts are made of 100% organic cotton — and are available in medium and large sizes. This prize was provided by Nautica, but Nautica is not a sponsor, administrator, or involved in any other way with this giveaway. All opinions expressed in the post are my own and not those of Nautica.

To win, leave a comment by Sunday, June 13. Then check back on Monday, June 14, when I'll pick a name from a random drawing. Entrants must be 18 or older and located in the US or Canada only.