backface culling?

WindchILL

New to substance designer. Is there a way to turn on double-sided shading? This was exported from Maya in obj format

Tzur_H

I'd check back in maya if your polys are flipped in those areas.
An easy way to check it is to turn off Two Sided Lighting in your perspective viewport > Lighting menu. If you see the polys are black, it means they are facing inside, you can then flip them by going to the Polygons menu > Normals > Reverse.