Final answer:
The protective (insulative) quality of structural gear is given as a relative value known as the Thermal Protection Performance (TPP) rating.
Step-by-step explanation:
The protective (insulative) quality of structural gear is given as a relative value known as the Thermal Protection Performance (TPP) rating. The TPP rating describes the insulating quality of a wall or similar barrier, in terms of how many Watts move through each square meter of surface area for each 1°C difference in temperature across the barrier.