We used to say (the noonprayer) with the Messenger of Allah ﷺ in the intense heat, but when someone amongst us found it hard to place his forehead on the ground, he spread his cloth and prostrated on it. (Using translation from Muslim 620)  

«كُنَّا نُصَلِّي مَعَ رَسُولِ اللَّهِ ﷺ فِي شِدَّةِ الْحَرِّ فَإِذَا لَمْ يَسْتَطِعْ أَحَدُنَا أَنْ يُمَكِّنَ جَبْهَتَهُ مِنَ الْأَرْضِ بَسَطَ ثَوْبَهُ فَصَلَّى عَلَيْهِ»