Drivers lose kilos per race in sweat.
F1 drivers lose kilos per race as they are subject to sweltering temperatures, high-stress and thick fire-retardant clothing for up to 2 hours.
This means the driver is sweating profusely and only supplied 1.5 litres of fluids on board. Meaning a driver can lose up to 4 kg per race!
In very hot conditions, drivers will wear an ice vest, to help keep their core temperature down, before the race start.
Watch this short clip on how drivers keep cool on WTF1.com - here
[caption id="attachment_10792" align="alignnone" width="1200"] Ice Vest : dailyexpress.co.uk[/caption]