Plimsolls were widely worn by vacationers and also began to be worn by sportsmen on the tennis and croquet courts for their comfort. Special soles with engraved patterns to increase the surface grip of the shoe were developed, and these were ordered in bulk for the use of the British Army. Athletic shoes were increasingly used for leisure and outdoor activities at the turn of the 20th century - plimsolls were even found with the ill-fated Scott Antarctic expedition of 1911. Plimsolls were commonly worn by pupils in schools' physical education lessons in the UK from the 1950s until the early 1970s.