Hard plastic. The clasps are very strong. Hoping it will stand up to the outside elements. I don't know about that plastic cracking in the cold winter months. This foam box is a great addition to my Milwaukee tools and cases. After I cut out the styrofoam for all my tools I still had room for another battery and I also added two more batteries and some bits that I use frequently. Simply make a cross on the styrofoam with a knife and insert the bits. I used a large fillet knife (pictured) to first cut each tool individually. After this first contour cut, I removed the tool and removed a few layers of packaging. I then proceeded to cut all the way through the styrofoam with a small knife. It worked this way for me, instead of tracing, I cut the tool and then moved it to the side to accurately continue my cuts. For batteries, the foam must be cut almost to the bottom of the foam. You'll find that the tool requires half the foam layer to be removed not all the way to the bottom of the box. It comes off in layers. I just bought another one for the worker so I can keep my tools safe and sound instead of throwing them in a 5 gallon bucket and banging them like he does. It's also easily accessible, grab the box and get to work quickly! I also bought a roll box and will test it soon. .
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