Description & Features
Precision-engineered for the gate-chasing athlete, the Atomic Redster TR F4 delivers uncompromising race-day performance. With a stiff 130 flex and a narrow 93mm racing last, this boot provides a locked-in fit and razor-sharp power transfer for maximum control at speed. The Formula PU shell and cuff, paired with dual-sided cuff alignment and Power Control, offer fine-tuned responsiveness and stability on demanding terrain.
Inside, the World Cup Race Liner with full lacing and Atomic’s Ankle Retention System ensures a race-tight hold and anatomical support, while the Redster AFS Tongue optimizes pressure distribution for powerful, consistent flex. A 55mm Professional Dual Strap and Dual Velcro Spoiler dial in the fit, and magnesium Elite Buckles secure every adjustment with confidence.
Featuring a Redster Solid Sole and ISO 5355 Alpine Type A compatibility, the TR F4 is built for racers who demand elite-level performance from the first gate to the finish line.
Features
- Ski Racing Boot
- 130 Flex Index
- 93mm Racing Last
- Shell Technology:
- TR Wall Thickness
- Power Chassis
- Anatomic Toe Box
- 0° Sole Canting
- Grind Grid
- Depth Guide Boot Board
- Cuff Technology:
- Dual-Sided Cuff Alignment
- Power Control
- Formula PU Shell/PU Cuff
- Regular Cuff
- World Cup Race Liner:
- Redster AFS Tongue
- Ankle Retention System
- Full Lacing
- Dual Velcro Spoiler
- 16°-18° Forward Lean
- Magnesium Elite Buckles
- 0° Shell Rotation
- 55mm Professional Dual Strap
- Redster Solid Sole
- ISO 5355 Alpine | Type A
Technical Info
REDSTER PROFESSIONAL DUAL STRAP
The upper half of the 55mm Professional Dual Strap strap sits on your liner tongue and the lower half sits on your plastic cuff, providing a very seamless transition from leg to liner to boot. It also incorporates elastic shock absorbing layers that smooths out choppy terrain and an outer static section that provides pure power and energy transmission. The outer static section is adjustable and allows you to fine tune the amount of suspension or responsiveness called for. The Redster version feaures a traditional, push-to-release cam buckle.
Formula Plastics
Engineered for consistency under pressure, Atomic’s Formula Plastics maintain a reliable flex across a wide range of temperatures—delivering predictable performance whether you’re training in the early season or racing in spring conditions. This advanced plastic compound gives athletes enhanced control, confidence at speed, and uncompromised power transfer in every turn—ensuring peak performance all season long.
Anatomic Toe Box
Designed for a more natural fit, Atomic’s Anatomic Toe Box is shaped to provide extra space for the big toe and a closer wrap around the forefoot. This creates a more uniform, pressure-free fit that allows the foot to rest in a neutral stance—improving comfort, balance, and overall control on the hill.
Power Chassis
Atomic’s Power Chassis reinforces the connection between toe and heel, reducing sole flex by 31% for maximum power transmission. The result: improved edge-to-edge response and more efficient energy transfer directly to the ski.
World Cup Liner
Developed in collaboration with top World Cup athletes, Atomic’s World Cup Liner delivers elite-level fit and performance. Crafted with a supple, one-piece microfiber outer and minimal seams, it molds precisely to the foot and boot shell for a race-tight feel, exceptional comfort, and maximum power transmission.
Ankle Retention System
Atomic’s Ankle Retention System enhances heel hold and responsiveness through an innovative lace-routing design. By guiding the laces through precision-engineered loops, this system creates a mechanical advantage over traditional lacing, delivering a tighter, more secure fit and a direct connection to the boot for quicker reaction times and maximum control.
