I hate cheap thongs, and only wear Slappas thongs during Summer. Cheap thongs nearly killed me once, I went sprawling over a rock embankment of the Ashburton River bridge, when I lost my footing as I started to climb down the rocks, taking a shortcut back to the caravan park.
I was just lucky I landed on my side on a huge flat rock, not a big sharp-edged one, like all the rest were. I would have incurred very major injury, maybe even killed myself, if I'd landed anywhere else.
I still did a lot of damage to my outer thigh muscle, I couldn't walk for a week afterwards, and I was in agony for most of that week.
Dirt-cheap footwear is a mistake when you get older. Spend the money to get good foot support, it not only assists with balance, but you walk better in them.
A lot of Chinese footwear puts you off-balance from the word go, because the soles are rubbishy design and they consist of crappy materials.