My product page is not displaying on a mobile device properly. 

The Page currently  displays the product image, product gallery and 3 lines of the text and then the page breaks. This is only apparent on mobile.

The product to be displayed is a varied product with 2 colours and 4 sizes.

https://rustyakira.com/product/gtbmv2-t-shirt/

Discovered that I'm able to see the entire page on mobile when I select 'view desktop version' in the browser options. Obviously this isn't the fix I need so any tips on how to rectify this would be most welcomed!