Kath.Artique review for Gelato: Print on Demand

Hello, thank you for the review. We're glad to hear you find Gelato easy to use! This article should help you with the sizes: https://apisupport.gelato.com/hc/en-us/articles/360017726419-Can-I-add-a-new-variant-to-an-existing-product-in-Shopify-. In case you'd need any further assistance, out Agents are available via live chat 24/7, and will walk you though the process step by step. Thanks, Bartosz