To determine whether the One Size Primer is vegan and cruelty-free, we would need to examine its ingredient list and the brand's policies.

A product is considered vegan if it does not contain any animal-derived ingredients or by-products. This includes ingredients such as honey, beeswax, lanolin, collagen, albumen, carmine, cholesterol, gelatin, and many others.

On the other hand, a product is considered cruelty-free if neither the product nor its ingredients have been tested on animals at any point during its production process. This includes both the brand itself and any third parties it may work with.

As for the One Size Primer, without the specific ingredient list, I can't confirm whether it's vegan. However, you can usually find this information on the product packaging or the brand's official website.

Regarding the cruelty-free status, it's important to note that this is not only about the final product but also about the ingredients used. Some brands might not test the final product on animals but might use ingredients that have been tested on animals by their suppliers.

To confirm if a brand is truly cruelty-free, look for certifications from reputable organizations such as Leaping Bunny or PETA. These organizations have strict standards and their certification is a reliable indication of a brand's cruelty-free status.

In conclusion, to confirm if the One Size Primer is vegan and cruelty-free, you would need to check the ingredient list for any animal-derived ingredients and look for cruelty-free certifications from the brand.