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A one-piece driving suit is available in single-layer and multi-layer. Different companies use different fire-retardant materials, so if your skin is sensitive to a certain material, know what you are buying beforehand. One-piece suits are a bit safer since there is no opening between the separate pants and jacket, but if you need special sizing, a one-piece suit can be ill fitting (too long in the legs, tight in the seat, and so on). They're also a bit hard to get in and out of if you plan on removing your suit between time slots.