"Great value for a high-quality diaper" is a phrase often used in marketing and advertising to communicate that a brand of diapers provides both high quality and a good price point. It suggests that the diapers are both effective and affordable, making them a good option for parents who want to ensure that their child is comfortable and dry without spending too much money.
When describing a product as great value, it means that it provides a good balance of quality and price point.
To make this phrase more specific, you might mention the quality features of the diapers, such as absorbency, softness, fit or leak protection. Additionally, you might provide some comparison data or statistics that back up the claim that the diapers are high-quality and affordable.