Hello,
Our theme does not include any additional plugins for the shipping. List of included plugin you can find here https://xstore.helpscoutdocs.com/article/36-included-plugins
But our theme supports all the default WooCommerce plugin options for the shipping https://docs.woocommerce.com/documentation/plugins/woocommerce/getting-started/shipping/core-shipping-options/
But default shipping options do not have the shipping calculator based on weight, so you need to use the additional plugin to implement this. Which one – check my first message.
Regards