This long sleeve top is part of the RW-7 range of flame retardant, Nomex race underwear from Sparco. It is constructed using a process known as 'body size' which has no stitching at the sides and allows differing levels of elasticity in areas of the garment for the very best fit and feel. The material features Sparco's X-Cool silver treatment which provides a cooling sensation against the skin.'Body size' construction allows for the best possible fit and feelFlame retardant Nomex material provides high levels of heat and flame protectionX-Cool silver treatment on the fabric gives a refreshing, cooling sensation on the skin and is anti-bacterialSeamless sides reduces pressure points for improved comfortSizesXS/S - 32" to 36" chest (42-48 continental)M/L - 38" to 46" chest (50-56 continental)XL/XXL - 48" to 52" chest (58-64 continental)FIA 8856-2018 approved