To keep whipped body butter from hardening, there are a few key factors to consider:

1. Ratio of Solid to Liquid Oils: When making whipped body butter, it's important to strike the right balance between solid and liquid oils. Solid oils like shea butter or cocoa butter provide the body butter with its thick and creamy texture. However, too much solid oil can make the body butter harder. By incorporating liquid oils such as almond oil or jojoba oil, you can keep the body butter softer and easier to whip.

2. Temperature: The temperature at which you whip the body butter can affect its consistency. If you live in a colder climate or during winter months, the body butter may naturally harden due to the lower temperatures. To prevent this, you can warm the solid oils slightly before whipping them. However, be careful not to overheat the oils, as this can affect their beneficial properties. Additionally, store the whipped body butter in a cool place to maintain its texture.

3. Humidity: High humidity can also cause whipped body butter to soften or lose its whipped texture. If you live in a humid environment, you may need to adjust the recipe slightly to include more solid oils or use ingredients with higher melting points. Adding a natural emulsifier like beeswax or soy lecithin can help stabilize the body butter and prevent it from becoming too soft.

4. Storage: Proper storage is crucial to maintain the consistency of whipped body butter. Store it in an airtight container to prevent moisture from getting in, as this can lead to spoilage or a change in texture. Keep it away from direct sunlight and extreme temperatures to maintain its whipped texture.

By considering these factors and experimenting with different ingredient ratios and storage conditions, you can create a whipped body butter that remains soft and easy to apply.