The president of a nudist group says she hopes more people will consider naturism and join their annual festival which begins today in Wellington.

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The New Zealand Naturist Federation expects about 130 people to show up to its 66th national festival in Te Marua which runs for a week.

Its president Donna Miller said going nude has physical benefits such as absorbing vitamin D without the barrier of clothes.

"It relieves stress and it also [goes] back to when you were a child, when you would run around without clothes and without a care in the world," she said.

"You're going back to that freedom ... before so-called responsibilities and interactments came in and it's a great way to be."

Ms Miller said there will be a range of activities during the festival, including table tennis, darts and volleyball.

She said if the weather is good, the participants will be taking part - naked.

"It depends, we've got a bit of a cold snap here at the moment so if that continues there might be a few more people wearing clothes, we're pretty practical," she said.

"But certainly if it's warm and sunny then most of those activities will be without clothes."