Sparco Prime+ Fire Resistant Racing Undershirt - FIA 8856-2018 Manufacturer_OMP Stretch material is added to

Stretch material is added to the knuckles and fingers for improved mobility

Note: HB691 is a modified version of the HB522 pad for the Mazda MX-5 Miata

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Sparco Prime+ Fire Resistant Racing Undershirt - FIA 8856-2018 Manufacturer_OMP Stretch material is added toSparco's professional level Prime+ line of racing underwear is specifically designed to meet the latest FIA 8856 2018 rating. Using an F1 derived double weave construction, the undershirt features ultra breathable fire retardant fabrics. The shoulder stitching has been strategically moved to the back to improve comfort and mobility. Finally, extra thin wrist cuffs reduce bulk underneath the suit for a more natural feel.