"Scott and Amundsen, who both comment in their diaries about sweating profusely"

Amundsen writes:

It was no use working in Polar clothing among these hills; the sun which stood high and clear, was uncomfortably warm, and we were obliged to take off most of our things.

Scott describes his approach to the Beardmore Glacier similarly:

The day was gloriously fine and we were soon perspiring…The pulling after this was extremely fatiguing. We sunk above our finnesko everywhere and in places nearly to our knees… All the time [the sledges] were literally ploughing the snow.

We got fearfully hot this morning and marched in singlets which became ringing wet… even now, one feels the cold directly one stops.