Sparco 00123644BIAZ Shoes: Automotive. Buy Sparco 00123644BIAZ Shoes: Racing Apparel - ✓ FREE DELIVERY possible on eligible purchases. Color: White/Blue . Size: 44 . Ultra-Soft Calf Skin . The Formula RB-8 is an all-new driving shoe for . The Formula RB-8 was developed using feedback from 's professional drivers. This development program created some unique features for the new shoe. The Formula RB-8 has the next generation sole made in pure lightweight rubber which enhances the pedal feel and is also anti-static, fuel and oil resistant. The mid-boot design features a full ultra-soft calf skin leather upper with perforated vents. The upper has a Velcro strap closure and Speed Laces for better support and adjustability (standard laces also included). Another unique feature of the Formula RB-8 is the Achilles stretch panel for improved mobility and comfort. The Formula RB-8 has a pre-formed anatomic insole.The Formula RB-8 is available in 5 colors in sizes 37-48 and is FIA approved. NEW FOR TECHNOLOGY Ultra-soft calf skin leather mid-boot design with Velcro closure for added support Achilles stretch panel for mobility and comfort Pre-formed anatomic insole Next-gen sole in pure lightweight rubber for excellent pedal feel Anti-static, fuel and oil resistant sole Speed Laces and Standard Laces included FIA approved . . .