The Predator XP will undoubtedly appeal to backs. It is designed for speed and power. They are mostly used by back players such as Manu Tuilagi, but they may also be worn by flankers such as Tom Curry and second rowers such as Alun Wyn Jones. The boot has proven popular with former players too, including Joe Simpson who bought a pair after his retirement. Built like a tank, the XP is engineered from high-density foam with an aluminum core for light weight and durability. The midsole is made of ethylene vinyl acetate (EVA) while the outsole is rubber. It features TPR (Thermo Plastic Rubber) which provides excellent traction on both wet and dry surfaces. Tom Curry's boot has black and yellow colors with black trim. It was first released in 2003 and has been continuously improved since then. In addition to playing rugby, the Predator XP is also used by athletes such as cyclists and runners who need supportive shoes. Curry is one of many international players to have donned the XP during its tenure as a rugby union shoe. Others include Jocelyn Butler, Matt Henjak, Tendai "Ten" David, Semesa Rokoduguni, Siale Piutau and Victor Matfield. Curry still plays in the NRL with North Queensland Cowboys where he usually lines up as a winger.