From our experience as specialists inGoogle Shoppingone of themain causes of abandonment of the purchasing process in this type of campaign is usually motivated by the inaccuracy of shipping prices of products.
Users value the fact that the price shown in Google Shopping exactly matches the price they will later find in the store. The problem was that sellers often had problems providing these costs in Google Merchant. Products with irregular measurements or variable tables depending on distance, weight and measurements made this an impossible action.
Today Google announces new attributes, "shipment length", "shipment width" and "shipment height", which will help to more accurately calculate shipping costs. Day by day, Google makes it easier for us to perform more valuable actions by adding new attributes and functions to our Google Shopping campaigns.
I pass you the link at Official Google Blog for those of you who would like more information. Good news that will help many advertisers to achieve their goals in their ecommerce.