Sparco RW-4 shorts, from the entry level of their race underwear range. Part number 001711BBI.
They are made from a soft flame retardant material with a differentiated mesh structure, so the panels that need to breathe do and the rest holds its shape, and the waistband is more heavily elasticated than the body of the short for comfort under a suit.
The thing to understand about the approval
These are flame retardant but they are not FIA or SFI approved, and the reason is their length. Approved underwear has to cover the leg, and a short does not. So if your regulations call for homologated underwear, these will not satisfy the scrutineer no matter what they are made of.
Where they earn their place is a hot day when rated protection is not required, or worn under long approved underwear as an extra layer. Plenty of drivers run them for testing, track days and club karting where the rulebook does not specify.
Sizes, by waist measurement
S is a 31 to 33 inch waist, which is 78 to 85cm. M is 34 to 36 inches, 86 to 93cm. L is 37 to 40 inches, 94 to 101cm. XL is 40 to 43 inches, 102 to 109cm. XXL is 43 to 46 inches, 110 to 117cm.
Take your actual waist measurement rather than your trouser size, because underwear is meant to fit close and a size up defeats the point of it.
White, and they go in the wash normally.
If you need FIA 8856-2018 underwear instead, ask us and we will point you at the Nomex range.







