Shopify » URL

A Shopify Url field type basically behaves just like a Text (or Shopify Single line text) field, allowing you to enter a URL.

Defining the field as a URL type ensures that the content is a fully qualified URL complete with a protocol scheme (https://, http:// etc.):

<a href="{{ product.metafields.accentuate.instructions.value }}">Click to view instructions</a>