As part of the RW-10 range of race underwear from Sparco these long johns are constructed using the very lightest fireproof material with extra flat seams to eliminate pressure points for reduced fatigue. The material features Sparco's X-Cool silver treatment which provides a cooling sensation on the skin.Ultra lightweight without compromising protectionUltra flat seams for superb comfort levelsPrinted logos to keep weight to a minimumX-Cool silver treatment provides a cooling sensation and is anti-bacterialThe RW-10 range of underwear from Sparco has been designed to surpass the stringent FIA 8856-2018 approval for increased heat and flame protection and also to meet the demands of top level race teams such as McLaren Formula 1.Sizes:XS - 70-77cm waistS/M -  78-93cm waistL/XL - 94-109cm waistXXL - 110-121cm waistFIA 8856-2018 approved