Foam is firmer than standard Pelican or Plano stuff, but compresses tight if it has to. Always springs back to normal position even after several days compressed. The half inch thick pieces are super easy to cut through even with a knife or scissors and makes a clean, tidy cut effortlessly. 3M super 77 spray adhesive can then join together several half inch pieces very firmly making them effectively a single piece. Very easy to work with and functions perfectly. The only downside is every piece I've gotten arrives with small holes roughly 1-3mm wide and as deep. Doesn't affect function since there's not many and they're not large, but it does affect aesthetics and it can be hard to get a uniform looking surface.