England boss Eddie Jones has introduced another innovation to bolster hopes of a third straight Six Nations title - heated pants.
England's replacements will wear the NZ$600-a-pair item to ensure they are fully prepared to come off the bench and make the maximum impact.
The pants are a design similar to those used by British Cycling - athletes wore them at the London Olympic Games in 2012 to help their muscles.
But this version, designed by Lizard Heat, cover a larger surface area compared to those seen in 2012. The creators say they are designed to act like a Formula One tire, heating deep into the core of the leg muscles.
According to the product's website, the pants are rechargeable, come with a fully portable power pack and an on/off button combined with a three-level temperature controller button which is integrated into the garment.