10% from the sale of each pair of "XT597" shoes goes toward directly supporting  the 

F-4 Phantom XT597 served with the Royal Air Force's Aeroplane and Armament Experimental Establishment ( at Boscombe Down. At A&AEE, XT597 was involved in a variety of test and evaluation roles, including trials related to the aircraft’s avionics, weapons systems, and performance. These tests were crucial in ensuring that the British Phantoms met the RAF's operational standards and were fully integrated with UK-specific modifications.