These are the coldest stamps I have ever received, about the Imperial Trans-Antarctic Expedition (1914–17) conceived by Ernest Shackleton.
They belongs to Shackleton Stamp Set issued on 7 January 2016. Striving to Free Endurance is one of the scenes captured by pioneering photographer Frank Hurley. The stamps have been created from original glass photographic plates held by the Scott Polar Research Institute and the Royal Geographical Society.
See more Winter Scenes linked to Sunday Stamps - II.