[Help] Foam Padding for interior of costume

[zombienoms]

I'm looking for a padding, something like the stuff found inside bike helmets or like memory foam to pad the void spaces in my armor. Can anyone recommend a good source for this? cheap is better as saving money always nice. Needs to be flexible, softer but still dense to hold up shape and support the exterior, and thicker as I have skinny arms and the forearm pieces have alot of gap to fill

 

[P4r4dox86]

I cut strips off of a memory foam pillow that I didn't need to pad the inside of my Iron Patriot.