JEDDAH: Saudi Arabia’s footballers are set to use high-tech cooling devices with a pre-frozen gel lining to combat high temperatures during the FIFA World Cup. The Green Falcons kick off their campaign against Uruguay at Miami’s Hard Rock Stadium on Tuesday, when temperatures are expected to reach 32 C with high humidity. Adidas developed the Climacool system especially for high-temperature environments, using technology derived from that used by Formula 1 drivers. The cooling vest includes a special gel which is frozen before play and which can lower skin temperature by as much as 13 C.