When I need to choose FR clothing or aluminized heat protection? 

FR clothing is designed to protect against fire and heat by preventing the clothing from igniting and spreading flames. FR clothing is typically made from materials that have been treated with fire-retardant chemicals or from fibers that have inherent flame-resistant properties. 

Aluminized heat protection, on the other hand, is designed to protect against high heat and radiant heat. Aluminized clothing is made from materials that have been coated with a reflective material, such as aluminum, to reflect radiant heat away from the wearer. 

If the primary hazard is fire, then FR clothing would be the best choice. If the primary hazard is radiant heat, then aluminized heat protection would be a better choice. In some cases, a combination of both FR clothing and aluminized heat protection may be necessary to provide adequate protection against both fire and radiant heat hazards.