Amyand's Thermal Suit

Amyand wears the reinforced thermal suit disguised as a Sontaran, its outer layer scorched by lava fields en route to the settlement. The suit’s insulation lets him endure radiant heat long enough to deliver the temporal stabilizer to Turlough.

The reinforced thermal suit is handed by the Doctor to Amyand immediately before the final gambit. It endures extreme heat and physical strain during Amyand’s treacherous march through lava fields and fire to deliver the stabilizer to Turlough.