It's a summer institution with its own national day - but the trusty Jandal may do more harm than good.
Researchers in Sydney have launched a six-year study into how much stress the slip-ons put on feet.
Children will test Jandals and other forms of footwear to see which is best for them.
Sensors will be attached to their feet - which are easier to study than those of adults - and their walking will be filmed and measured.
"Some people will claw their feet to keep the (Jandal) on, while others will extend their toes," said Angus Chard, a researcher and podiatrist from Sydney University.
Friday is National Jandal Day, a fundraiser for Surf Life Saving New Zealand.
Auckland podiatrist Simon Speight said tendonitis on the top of the foot was a risk with Jandal wearing. "The other biggie is arch strain."
But he didn't think people should stop wearing them.
What's your view?
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