When sourcing these suits, the primary focus must be on the material composition and heat reflection capabilities. Ensure the outer layer is made of vacuum-aluminized flame-retardant fabric, which should reflect at least 90% of radiant heat. The suit should consist of a multi-layer structure (outer shell, moisture barrier, thermal liner, and comfort lining). For industrial use, verify that the material can withstand temperatures up to 1000°C (radiant heat) and that the tear strength exceeds 65N to prevent accidental punctures in harsh environments.