quick view simple plugin

[graphicjeon]

https://www.buckmason.com/collections/hunker-down

im looking for this quick view plug in 

do you guys know what is this the name?

[Vignesh96]

Hey Jeon,

Seems like the quick add option which is allowing you to select size variants (as seen in your link) belongs to a premium theme. 

There are some shopify apps which you might find useful:
1. Quick Select: Size Swatch

2. Quick View: Quick View By Secomapp, Quick View & Color Swatch ++

Let me know if this helps. Cheers!