Wavelength RF Cap
We've tested this fabric and it has the abilty to completely "knock out" a cell phone signal causing the call to drop, a testatment to the effictiveness of the fabric. It is constructed from a comfortable circular knit fabric treated with silver. Great for thermal regulation in addition to RF shielding and fits under a wide range of headwear.
|Head Circumference||XS - 20"||S - 21"||M - 22"||L - 22"||XL - 24"|