A defense barrier, also known as defensive barrier, bastion or blast wall, is a modern metal network used for defense. This type of barrier is composed of a foldable wire mesh container and heavy geotextile, serving as either a temporary or semi-permanent fortress to block explosions or small arms attacks. Defense barriers are essential in providing protection for installations and public infrastructure around the world. Apart from their practical use in defense systems, they also offer a sense of security and peace of mind to citizens in areas threatened by potential attacks.

The defense barrier can be utilized to construct a variety of defense systems, including watchtowers, shoot points, and trenches on the ground. It has different sizes to meet various tactical requirements. Explosion-proof wall systems are important protective structures in modern warfare and flood control. In practical use, by filling the mesh box with stones, sand, or soil, a solid wire mesh protective wall is formed. Due to its simple installation, foldability, and ease of transportation, it is widely used in modern applications.