A big UX mistake on many eCommerce web sites is hiding access to the cart. The next logical step after adding a product to the cart is to buy it. Don’t frustrate your customers by making them search for the cart button!
Upon activationg this plugin will display a link to the WooCommerce cart which is visible sitewide and fixed in position so it remains visible wherever the user scrolls. When the user hovers over the tab, the full cart widget is displayed.
There are options (Catalog tab, WooCommerce settings) to display the cart tab on the right or the left, to use a light or dark skin to match your theme and to display the cart widget on hover or not.