Hadith 385
Narrated Anas bin Malik: We used to pray with the Prophet and some of us used to place the ends of their clothes at the place of prostration because of scorching heat.
Hadith 542
Narrated Anas bin Malik: When we offered the Zuhr prayers behind Allah's Apostle we used to prostrate on our clothes to protect ourselves from the heat.
Hadith 1208
Narrated Anas bin Malik: We used to pray with the Prophet in scorching heat, and if someone of us could not put his face on the earth (because of the heat) then he would spread his clothes and prostrate over them.