The fireproof document box is made of three-layer materials,
including liquid silicone, sponge and nylon. Liquid silicone is
fireproof and waterproof material that coated the outer pocket and
is strong enough to protect the inside. The sponge is hidden in the
middle layer to stay stable and give the items a soft hug; the
inner material is nylon that connects the other parts and acts as a
net. Three materials work well and provide better protection for
items.
