After having the Sizefox widget up and running on your store, you might need to add new products to your catalog.
With Sizefox, this is easy: you will not need to worry about size-chart reassignment after each new product import. In fact, your new product pages will be automatically detected every time that the widget script is loaded. And your new products will automatically display the Sizefox widget if they fall into the matching conditions of a published size-chart.
That's why it is important that you do not remove the snippet from your code base, even if you are currently not using any size charts in your store.
When you want to activate a new size chart, or publish a previous one, Sizefox will detect your most recent product pages and the widget will be displayed according to the matching conditions of your size-charts.