Editing SATRA (section)

==Everest boots==
SATRA played a role in the successful expedition to the top of [[Mount Everest]] in 1953 in which [[Sir Edmund Hillary]], along with [[Tenzing Norgay]], became the first person to 'stand on top of the world'.<ref>{{Cite web |date=2024-06-02 |title=Everest summit boot made in Kettering 'still works' 71 years on |url=https://www.bbc.com/news/articles/czrr4g08mego |access-date=2024-07-10 |website=BBC News |language=en-GB}}</ref> In 1952, SATRA was approached by The British Expedition to produce 34 pairs of boots to meet the challenge of climbing in one of the most inhospitable environments on the planet. The boots were designed to provide a high level of [[thermal insulation]] for use in high altitude and saw a combination of inner vapour barrier, mesh insoles and an integrated rubber outer gaiter: the water resistant vapour barrier's inner layer stopped the boots becoming soaked with sweat then freezing; the mesh insole allowed sweat to disperse from the socks; the outer gaiter prevented melting snow soaking in to the boot itself. There were five layers of [[Ceiba pentandra•kapok]] insulation, a naturally hollow fibre and a forerunner of synthetic versions. The boot lasting technique helped prevent compression of the vital insulation material and microcellular resin soles further improved insulation and decreased weight.

The result was boots that weighed only 4&nbsp;lb 4oz (1.9kg) almost 1kg lighter than comparable footwear at the time, and a successful expedition in which no-one who wore the boots got frostbite – a remarkable achievement.<ref>{{Cite web |title=BBC - A History of the World - Object : British Everest Expedition assault boot |url=https://www.bbc.co.uk/ahistoryoftheworld/objects/WGOOd5y9SZSyPK8g7eZ2uA |access-date=2024-07-10 |website=www.bbc.co.uk}}</ref>