Features:- This is the Factory FX upgrade to the previous best seller, the B3
- The B4 feature all new high tech, high durability, super grip material that keeps you in place in the worst imaginable conditions
- Heavy duty DuraTech ballistic nylon reinforcements to prevent knee brace wear
- Includes TPR embossed logos
- Relentless track testing and development make this seat the choice for pro racers across the globe
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