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Overview Application OMP FIRST top is an entry level fireproof racing underwear top / nomex undershirt. The OMP FIRST racing underwear features a shaped neck and raglan sleeves to increase comfort. Regular fit. Shirt Sizes relative to OMP Suit Sizes: XS: suit 42-44; S: suit 44-46; M: suit 48-50; L: suit 52-54; XL: suit 56-58; XXL: suit 60-64. Certification: FIA 856-2018. Manufacturer Part Number: …