That's your choice. There are a lot of good arguments to wear one, especially when you're first learning.
I never have worn a mask, and I learned to roll with my eyes closed, so I roll by feel, and not by sight. It's a benefit if you capsize in murky water for real. But as Jay points out, I have had a few sinus infections that can probably be linked with rolling for fun and having my noseclips fall off.
Everyone has their own preference.
Wall Mount Boat Racks
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