As you might expect:

• Heavier fabrics typically have higher arc ratings, thanks to their mass.
• Thicker fabrics typically have higher ratings, thanks to the air entrapped in the weave.

But did you know that by adjusting the construction of a fabric, we can increase or decrease its protective capacity? A knit fabric (like the type used to make t-shirts) will typically have a higher arc rating than a woven fabric (used to make button down shirts) made from the exact same fiber blend and weight. This is because knit fabrics are loftier – resulting in more air entrapped in the weave.

Within woven fabrics, the type of weave used – for example, a chambray fabric versus a sateen fabric – can also impact the fabric’s arc rating. Generally, the tighter the weave, the higher the arc rating will be if all other variables are equal.

These details are all carefully considered in designing AR / FR fabrics – and in selecting the fabrics used to make your finished AR / FR garments.

Learn more about the science and processes that go into making your protective garments:

• FRC: How It’s Made
• How AR / FR Clothing is Tested
• FR Clothing Materials