Most drivers believe that the more material a suit has, the safer it is. This would make sense in many other applications – more layers, less risk. However, that’s not how modern racing suits function. The design challenge isn’t creating a suit that can withstand fire; it’s creating one that won’t exhaust the driver before fire becomes a risk.
Weight and breathability are not choices of comfort – they’re variables of safety. And when they’re treated as such, the entire design process changes.
What Modern Nomex Construction Actually Changed
The Nomex layers used in early flame-resistant suits used to be stitched together, with each layer being responsible for one task. The sandwich weaves of today are bonding the upper and inner layers on a material level. An especially developed fiber for flame resistance is combined with a fiber used for thermal insulation and fibers for moisture management. Compacted to one very stable construction allows us to reduce the weight significantly.
We can reach weight savings of up to 20-30% and still hold the thermal protective performances according to the most recent FIA Norm 8856-2018 measure the time when a second-degree burn occurs under direct flame exposure. Lighter suits meanwhile reach more protection seconds than heavier suits because the heat flow through the material (thermal conductivities) is developed with the construction of the weave and not just pure increasing of grammage.
Heat Stress and The Cost Of Carrying Too Much
Inside closed-cabin race cars, drivers can experience temperatures exceeding 50°C (122°F) and lose up to 2 liters of sweat per hour during a race. Aside from the obvious hydration issue, that level of sweat loss will cause a driver’s body core to overheat and cognitive function to drop off a cliff. A hot, stressed driver does not brake as accurately or hit visual markers as perfectly.
Modern suit liners feature hydrophilic treatment to wick sweat from the skin rather than absorbing and trapping it. That sweat needs to be transported away from the skin to the outer layers as rapidly as possible, and after that, it should be able to evaporate. To make that happen, there’s ventilation in the helmet and the suit, right where your body is.
The suit has stretch panels in the lower back and under the arms to ensure it stays skin-tight without getting bunched up. The bulkier the suit and the bigger the air gap between the driver and the suit, the worse the heat retention.
Why Pedal Feel Is An Engineering Specification
Footwear is the most technical aspect when it comes to the trade-off between weight and protection. Unfortunately, most drivers do not realize how high the stakes are. The thicker the sole, the more you are protected from heat transfer, but you also lose information your foot should give you on how the pedal is behaving. Two-piece rotors can sometimes give the pedal a little sponginess, some slash-cut pads have an odd initial bite unless they are immediately at prime temperature. In all those scenarios, it’s helpful to get feedback from the foot.
Ultimately, your foot is the only temperature sensor in the braking system and the frontline force sensor. It’s vital that it can do its job. Thin, fire-retardant sole construction is, therefore, the key to all this. Custom made race boots will liberate you from the classic issues of a delayed braking signal; dead space in the boot causing painful blisters over a long stint, or delaying the mechanical signal as the boot drags between foot and pedal movement. This is measured in fractions of a second. At 200 km/h, some fractions of a second add five meters to every braking zone. Carbon fiber inserts in the boot structure do the job of any other reinforcement.
Fit As A Performance Multiplier
Custom fit applies to the full kit not only boots. Finger joints do not benefit from material bunching due to pre-curved anatomical shaping in gloves, which are the transmission zone of the direction feel. A glove struggling with the natural grip position of the hand forces the driver to compensate for the gripping force, resulting in over-strain of the arm during the race.
Suit ergonomics in the cockpit position follow the same principles. The driver is sitting with their knees elevated and arms forward during the race. Seams articulated and stretch zones adjusted to the cockpit geometry, not the stand geometry, allow the driver a tighter suit with no restriction of movement. This also translates to the emergency exit performance as the speed of emergency exit is also a safety factor.
Off-the-shelf gear is designed to fit the test dummy and the widest variety of bodies. This does not equate with the one body of a driver in one car fit.
Getting The Balance Right
Those drivers who look at their gear as precision tools instead of required equipment typically have reserves left at the end of the long races; both physically and mentally. The technology is here to build racing gear that is truly lighter, truly cooler, and truly safer than anything even a decade ago.
The caveat is that none of the material science actually works if the utilization of it is not exact. This means that with generic sizing comes the dead space and bunching that counteracts everything that the material engineering was supposed to solve. Lighter gear used improperly is still heavy gear. The spec on the tag matters significantly less than the fit on the driver.