I am trying to model a coffee pouch and below is a picture.

[![enter image description here](https://i.stack.imgur.com/RTbLm.jpg)](https://i.stack.imgur.com/RTbLm.jpg)

Below is a mesh of what ive modelled so far,
and the highlighted vertices are where pressure physics are applied to.
(excluded vertices are all pin group)

[![enter image description here](https://i.stack.imgur.com/RYHHF.png)](https://i.stack.imgur.com/RYHHF.png)

Below is what I got as a result :

[![enter image description here](https://i.stack.imgur.com/vf1Rf.png)](https://i.stack.imgur.com/vf1Rf.png)

as you can see the top and bottom parts of the inflated area are sort of blurred
and I cant figure out why this is happening.
I was trying to get the clean distinction line between the pin group and the inflated area.

Below is my phsyics tab

[![enter image description here](https://i.stack.imgur.com/hv4sw.png)](https://i.stack.imgur.com/hv4sw.png)

How can I get rid of the blurs?

Let me know if I need to provide any other details

Thank you all as always! :)