Ultra light Footstrap - Monster foiling

Are you looking for ultra light, comfortable and flexibel footstrap for wingfoiling? Have a look at these foot straps. They weigh just 38 grams, and are also made for 'us' large feet people ;)
You can lie down and paddle on these footstraps, and stand on them without hearding your feet or body. It's a one piece comfortable EVA material, so there wont be any edges to cut or wear your feet on.
Adjusting the size of the strap can be done on each side. You can make the strap smaller or larger by screwing the bolts in 1 of the 3 wholes, located on each side. The straps should fit most feet, even using boots.
Dutch: wingsurfer.nl/...
English: wingsurfer.sho...
Or have a look at monsterfoiling...

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What are these anti twist blocks under the footstraps?

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You can see them on the photos here: wingsurfer.shop/product/footstrap-monster-foiling/