Wales have been training for anticipated humid playing conditions at the World Cup by using rugby balls covered in baby oil.
Head coach Warren Gatland believes that humidity is going to be a factor during the tournament in Japan.
England boss Eddie Jones feels his side are fully equipped to cope with such a scenario, and Wales have also left no stone unturned.
Day-time temperatures at Wales' current base in the southern Japanese city of Kitakyushu are 30 degrees-plus, with 75 percent humidity, and similar weather is expected elsewhere during the 44-day competition.
And Wales have already been taking measures in an attempt to replicate anticipated slippery handling conditions.