I used this under a wig I wore to keep fleas off of my bald head. It gets hot and eventually ripped so I had to use a woman's pantyhose. If you are really in a bind, you can even use material from your underpants, make sure it's breathable.

<a data-hook="product-link-linked" class="a-link-normal" href="/Styrofoam-MODEL-HEAD-HAT-Wig-DISPLAY-Mannequin-Foam/dp/B000V9PYHY/ref=cm_cr_arp_d_rvw_txt?ie=UTF8">Styrofoam MODEL HEAD ~ HAT Wig DISPLAY Mannequin Foam</a>