How is it different from ordinary roti?
It is a dish in which thin roti is wrapped around fine sugar threads. The way of eating and the texture differ from roti with banana or other toppings.
Roti Sai Mai · โรตีสายไหม
In Ayutthaya, try roti sai mai, thin roti wrapped around sugar threads. It is a snack in which fine sugar threads are put on roti and rolled up to eat. When you wrap it yourself, you can add the sugar threads a little at a time and enjoy the sweetness you like. You could also open the roti one sheet at a time and share with your companion.

The texture of thin, soft roti and fine sugar threads blend. The sweetness depends on how many sugar threads you add. Add only a little at first, and on the next roti add more to your taste.
Add the sugar threads a little at a time and you can eat it at the sweetness you like.
Roti sai mai is linked to the snack culture that Ayutthaya's Muslim community has kept alive. Some roti gets a green colour from pandan aroma, and some uses sesame seeds. Unlike an ordinary roti menu, wrapping the sugar threads is the character of this snack.
It is a dish in which thin roti is wrapped around fine sugar threads. The way of eating and the texture differ from roti with banana or other toppings.
There is also a form in which roti with pandan aroma is wrapped around sugar threads. The actual aroma and ingredients can differ from seller to seller.
If you want to read more about these dishes and regions, these sources are a good place to start. Ingredients and cooking methods can differ from one eatery to another.
Sharing image credit: Takeaway · CC BY-SA 3.0