What foam is best for helmet padding?

I have a pair of ODST helmets, but they are not wearable because they have no padding. I tried using very thick and coarse packaging foam (The kind that holds computer parts in place while in the box). That was a failure because they were too stiff, difficult to cut cleanly, and uncomfortable

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Team Wendy Epic Air Combat Helmet Liner System

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Helmet Concussion Padding (12 x 12 x 1/2) – Valkyrie Forge Inc.

Here's the deal: Anyone who has issued military helmet pads knows the fatigue, hot spots, and overall discomfort caused by poorly designed combat helmet pads. Now HHV's Comfort PLUS Ballistic Helmet Pads not only bring a new level of comfortability but protection as well. The first layer designed for added blunt and impact resistance. While the second comfort layer is comprised of a proprietary memory foam layer that provides all-day comfort.

Hard Head Veterans Comfort Plus Helmet Pads (Ballistic Liner Upgrade) Fits mich, Ach, Fast, ate and Other Helmets

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Good For Entry Level and Practice Adjustable Mild Steel Grille Washable Sweat Band and Cushions EVA FOAM PADDING FOR BETTER PROTECTION Air Vent

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What foam is best for helmet padding? Halo Costume and Prop Maker Community - 405th

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