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ATOMIC Redster STI 70 LC
The ATOMIC Redster STI 70 LC are junior race ski boots with a 70 flex and an exceptionally narrow 93 mm racing shell, designed primarily for lighter and smaller racers who need the precision of a true race boot while still being able to properly load and flex the shell. The model belongs to Atomic’s Redster race line and is specifically designed for junior racers with shorter and narrower feet.
One of the key elements is the SLIM RACE SHELL construction. Its thinner shell walls are designed to provide improved flex behavior and more precise control while maintaining the stability required for racing. Combined with a 70 flex index, this creates a race boot with stiffness tailored to the needs of lighter athletes, allowing them to work more actively with the front of the shell.
The exceptionally narrow 93 mm Racing fit, World Cup Liner, V3 TONGUE SYSTEM, DUAL-SIDED CUFF ALIGNMENT and four 7000-Series Aluminium buckles create a technically focused package emphasizing precise foot retention and efficient transfer of skier input to the skis. The upper section of the boot is completed by a 35mm Velcro Strap.
Who are these ski boots for?
The ATOMIC Redster STI 70 LC are designed for junior racers, particularly lighter and smaller athletes who need a genuine race construction adapted to their physical characteristics. This is not a conventional junior performance boot, but a specialized race model with an exceptionally narrow 93 mm shell.
This model is particularly suitable for skiers who:
- regularly train race technique or participate in competitions
- need a 70 flex appropriate for a lighter junior racer
- have shorter and narrower feet or require a very close race fit
- are looking for an exceptionally narrow 93 mm Racing shell
- require precise foot retention and fast boot response
- want SLIM RACE SHELL construction
- will benefit from the World Cup Liner and V3 TONGUE SYSTEM
- need cuff adjustment through DUAL-SIDED CUFF ALIGNMENT
- prefer a traditional four-buckle race closure
- want a specialized junior race boot rather than a more comfort-oriented performance model
Because of the extremely narrow 93 mm race fit, correct sizing and anatomical compatibility with the foot are essential. Professional bootfitting is highly recommended for this type of ski boot.
How do the ski boots perform on snow?
The character of the Redster STI 70 LC is focused primarily on precision, fast response and control appropriate for a junior racer. The narrow shell limits unwanted movement of the foot inside the boot and creates a closer connection between the leg, shell and ski.
The 70 flex is an important part of the overall concept. For a lighter racer, a stiffer boot does not automatically mean better performance. If the skier cannot properly load the shell, excessive stiffness can restrict active movement and pressure control. The Redster STI 70 LC therefore combines race geometry and a precise fit with a flex that a lighter junior athlete can use more effectively.
The SLIM RACE SHELL with thinner walls supports controlled shell flex under load while maintaining the stability required for race skiing. The result is a boot focused on precise ski control, rapid transfer of skier input and controlled pressure management throughout the turn.
How to read the parameters
Flex index 70
The 70 flex needs to be considered in the context of a specialized junior race boot. The number alone does not mean that this is a recreational or soft all-round ski boot. The Redster STI 70 LC combines this flex with an exceptionally narrow 93 mm Racing shell and construction elements specifically focused on racing.
For a lighter and smaller racer, a correctly selected 70 flex can allow more effective loading of the front of the boot, better pressure management and more active movement throughout the turn than a significantly stiffer shell that the skier is unable to flex sufficiently.
Flex indexes are also not completely standardized between manufacturers. The value of 70 should therefore always be considered together with the shell construction, internal volume and race-oriented character of the model.
Shell width 93 mm Racing
The 93 mm Racing width represents an exceptionally narrow race fit. According to the supplied information, the construction is specifically designed for shorter and narrower feet, with the aim of creating the most precise possible contact between the foot and shell.
Reduced internal space helps limit unwanted foot movement, which is particularly important during rapid edge changes and precise ski control. However, a shell this narrow should not be selected based solely on nominal foot width – heel shape, instep, forefoot shape and overall foot volume are equally important.
With a 93 mm race boot, proper fitting and potential professional shell modification are therefore particularly important.
Technologies
SIZE ADJUSTER
SIZE ADJUSTER technology is focused on the possibility of adapting the internal sizing of the boot. In a junior race model, it can help better adapt the internal space to the skier’s current needs.
The exact design and adjustment range are not specified in the supplied information, so specific values or an exact adjustment mechanism should not be assumed.
SLIM RACE SHELL
SLIM RACE SHELL is one of the most important construction features of the Redster STI 70 LC. This specialized shell construction uses thinner shell walls, which according to the supplied information support improved flex behavior and control while maintaining the necessary stability.
This principle is particularly important for lighter racers. The shell needs to provide race-level precision and support while still allowing the skier to actively work with the flex and effectively pressure the front of the boot.
WORLD CUP LINER
WORLD CUP LINER is a race-oriented liner technology. The model uses the World Cup Liner, which complements the exceptionally narrow 93 mm Racing shell and supports precise foot positioning.
Within the overall construction, its role is to create close contact between the foot and shell and support precise boot response. The supplied information does not specify heat molding or other customization methods, so these features should not be assumed.
V3 TONGUE SYSTEM
The V3 TONGUE SYSTEM is part of the race-oriented boot construction and relates to the tongue area of the liner.
Its exact construction and any potential adjustment range are not specified in the supplied information. It should therefore be understood as one of the components complementing the race fit and the connection between the foot, liner and shell, without attributing unsupported functions to the system.
3D STRETCH TOE BOX
3D STRETCH TOE BOX technology focuses on the forefoot area of the liner around the toes.
In an exceptionally narrow race model, the construction of the toe area is important for combining a precise fit with the necessary space for the foot. The technology complements the overall race-oriented liner concept without changing the fundamental character of the very narrow 93 mm Racing shell.
DUAL-SIDED CUFF ALIGNMENT
DUAL-SIDED CUFF ALIGNMENT allows the cuff position to be adjusted relative to the skier’s lower leg.
This type of adjustment can help better align the cuff with the individual anatomy and race stance of the skier. The exact adjustment range is not specified in the supplied information and therefore should not be quantified further.
FULL MICROFIBER OUTER
FULL MICROFIBER OUTER refers to the use of microfiber material on the outer section of the liner.
This element forms part of the race-oriented liner construction. However, the supplied information does not specify additional properties of the material, so particular thermal, waterproof or other performance characteristics should not be attributed to it without further manufacturer information.
PU/PU race construction
According to the technical specifications, the Redster STI 70 LC uses a PU/PU shell construction. This forms the structural basis of the race-oriented boot and works together with SLIM RACE SHELL and the 70 flex.
The complete package is designed for lighter junior racers who require a highly precise fit but must also be able to actively load the shell. It is this combination of narrow geometry, specialized shell construction and appropriately selected flex that distinguishes the Redster STI 70 LC from conventional junior performance boots.
The specified weight is 1,798 g per boot in size 24–24.5, providing a clear reference value. The model comes in a Red/Black color combination, with manufacturer code AE5024440 and product code N22001188.
World Cup Liner and race fit
The World Cup Liner is an integral part of the overall concept focused on precise foot positioning. Combined with the exceptionally narrow 93 mm Racing shell, it creates a fit intended for race use, where minimizing unwanted foot movement is a priority.
The 3D STRETCH TOE BOX focuses on the toe area, while the V3 TONGUE SYSTEM works with the tongue construction. FULL MICROFIBER OUTER complements the outer construction of the liner. Together, these elements form a specialized internal setup consistent with the race-oriented purpose of the model.
Because of the very close race fit, sizing should not be based solely on experience with more comfort-oriented junior ski boots. Correct fit should take into account both the anatomy of the foot and the desired level of race precision.
Four 7000-Series Aluminium buckles and 35mm Velcro Strap
The ATOMIC Redster STI 70 LC use four 7000-Series Aluminium buckles, providing a traditional and precise closure for the race shell.
The upper section is complemented by a 35mm Velcro Strap, which helps stabilize the cuff around the lower leg and works with the four-buckle system to create a secure connection between the skier and the boot.
The combination of four buckles and the upper strap corresponds to the precisely focused race character of the model, where stable positioning of both the foot and lower leg is important.
Cuff angle 16° / 0°
The technical specifications list a cuff angle of 16° / 0°. This parameter relates to the geometry and skier position within the boot and forms part of the model’s race-oriented setup.
Because the supplied information does not further explain the meaning of both listed values or the specific possibilities for changing them, it is appropriate to retain the exact 16° / 0° specification without inferring an adjustment mechanism or range.
Racing Sole (non-replaceable)
The model is equipped with a Racing Sole (non-replaceable), meaning that according to the supplied technical specifications, the race-oriented sole is not replaceable.
With this type of race boot, compatibility between the specific sole and the binding being used should always be verified. No specific ISO standard or GripWalk compatibility is stated in the supplied information, so neither should be assumed.
70 flex in a true junior race boot
When viewed purely as a numerical value, flex 70 may appear relatively soft. In the Redster STI 70 LC, however, it needs to be considered together with the 93 mm Racing shell, SLIM RACE SHELL and the race-oriented character of the entire construction.
The model is designed for lighter racers who need a high degree of precision while still being able to properly load the boot. For such a skier, a 70 flex can be functionally more appropriate than a significantly stiffer race shell that would restrict active fore-aft movement.
The result is a specialized junior race boot combining an exceptionally narrow fit and precise control with a flex tailored to the physical capabilities of a lighter racer.
Comparison with conventional junior performance ski boots
Compared with conventional junior performance ski boots, the ATOMIC Redster STI 70 LC are significantly narrower and much more focused on race precision. The key difference is the 93 mm Racing shell, which creates substantially closer contact with the foot than constructions primarily focused on comfort.
SLIM RACE SHELL, World Cup Liner, V3 TONGUE SYSTEM, DUAL-SIDED CUFF ALIGNMENT and four aluminium buckles further emphasize the specialized race-oriented design. The priority here is not maximum internal space or recreational comfort, but precise control, fast response and efficient transfer of skier input to the skis.
The Redster STI 70 LC therefore make the most sense for a junior who genuinely trains race technique and can take advantage of a very close race fit.
Why choose the ATOMIC Redster STI 70 LC?
The ATOMIC Redster STI 70 LC are an excellent choice for lighter and smaller junior racers who need a genuine race construction, an exceptionally narrow 93 mm fit and a 70 flex suited to their physical capabilities. This is not simply a softened recreational boot, but a specialized Redster model designed for race-oriented use.
SLIM RACE SHELL combines thinner shell walls with the stability and control required for racing, while the World Cup Liner supports precise foot positioning and DUAL-SIDED CUFF ALIGNMENT allows the cuff position to be adjusted. V3 TONGUE SYSTEM, 3D STRETCH TOE BOX and FULL MICROFIBER OUTER further complement the specialized liner construction, while four 7000-Series Aluminium buckles and the 35mm Velcro Strap provide a secure closure.
For a junior racer who needs an exceptionally narrow 93 mm Racing shell, precise control and true race-oriented performance without unnecessarily high flex, the ATOMIC Redster STI 70 LC provide a specialized platform for further developing technique, precision and control in race skiing.
Procut classification
| For whom: | Junior |
| Type of ski boots: | Race |
| Type of skier: | Racer |
| Ski boot flex index: | 50-80, 70-100 |
| Boot Width: | 93 |
Technologies
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SIZE ADJUSTER
With technology Size adjuster you can adjust the size for an extra half size whenever you need. So now the shoe last longer, as the children grow.
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SLIM RACE SHELL
This totally unique shell construction has thinner walls meaning better flex and control for lighter racers.
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WORLD CUP LINER
Top and anatomically shaped inner shoe for achieving the best results.
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V3 TONGUE SYSTEM
Set up your space. The V3 Tongue System brings another possibility to create a perfect fit on the foot using different sizes of tongue use. You simply pull out the original tongue and replace it with another exactly as you need it.
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3D STRETCH TOE BOX
The new 3D Stretch Toe Box technology is asymmetrically preformed for the left and right foot and raises the bar in terms of adjustability a little higher. With this construction, the big toe has enough space and the length of the inner shoe can be fully utilized. Because with a little more stretch, crucial millimeters can be gained and the optimal fit can be achieved.
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DUAL-SIDED CUFF ALIGNMENT
Allows for lateral cuff angle adjustment to match the angle of the leg for increased comfort and control.
- FULL MICROFIBER OUTER
Technical description
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Shell
PU/PU -
Inner boot
World Cup Liner -
Flex index
70 -
Skeleton width
93mm Racing -
Closure system
4 buckles (7000-Series Aluminium) -
Power strap
35mm Velcro Strap -
WEIGHT
1798 g per Boot / 24-24.5 -
Forward Lean Shell Rotation
16° / 0° -
Sole
Racing Sole (non-replaceable) -
Color
Red/Black -
Product code
AE5024440
Other
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Product code
N22001188
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