Anti-static sprays can help prevent static buildup in materials like Polar Fleece Knitted Fabric by reducing the electrostatic charge that can accumulate on the fabric's surface. Here's how anti-static sprays work to prevent static in Polar Fleece and other textiles:

1. Adding Conductive Agents: Many anti-static sprays contain conductive agents, such as surfactants or mild conductive materials. These agents are designed to increase the fabric's ability to dissipate static electricity.

2. Surface Coating: When you apply the anti-static spray to the fabric, it forms a thin, conductive layer on the surface. This layer helps to disperse and neutralize any static charges that might accumulate.

3. Reducing Friction: Static electricity often occurs due to friction between different materials or between the fabric and the environment. The conductive layer created by the anti-static spray can reduce the friction between the fabric and other surfaces, minimizing the chances of static charge generation.

4. Improved Humidity: Some anti-static sprays may also contain ingredients that help maintain a consistent level of humidity around the fabric. Maintaining the right humidity level can make it more difficult for static charges to accumulate.

5. Enhancing Fabric Softness: Anti-static sprays can contribute to the softness and smoothness of the fabric, which can further reduce friction and the likelihood of static charge buildup.

6. Long-Lasting Effects: Many anti-static sprays provide a long-lasting effect, which means that the fabric remains protected from static buildup even after multiple uses and washes.

It's important to note that the effectiveness of anti-static sprays can vary depending on the specific product and the nature of the fabric. While these sprays are effective in many cases, they may not entirely eliminate static electricity, especially in extremely low-humidity conditions. However, they can significantly reduce the frequency and intensity of static discharges, making the fabric more comfortable to wear and less prone to attracting dust or lint.