Each IAG Wastegate Heat Shield is constructed with an outer layer made from pulverized volcanic lava rock This material is formed into a fabric and woven into a tight mesh weave. The blankets feature internal insulation made from high temperature calcium magnesium silicate wool, which is rated up to 2300°F peak. The insulation is held in place with a high temperature stainless steel mesh for increased durability. These heat shields will stand up to the harshest environments.