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Atomic·Ski boots·Race ski boots

Atomic Redster STR 3

Race boot with a flex of 110 and a narrow last, built for juniors and lighter competitive skiers.

686 €
1Size
686 €
  • Delivery in 2–5 business days
  • 30-day returns
Ski expert
Not sure about the size? Chat with a ski expert, or call +46 370 33 97 70.
Flex 110
Flex
Forgiving flex gives good support and control without feeling demanding.
91 mm
Boot width
Narrow low-volume last gives a snug fit and sharper precision in turns.
4 buckles
Buckles
The four-buckle system lets you fine-tune pressure across the foot.

About Atomic Redster STR 3 – Race ski boots

The Atomic Redster STR 3 is a race boot for lighter skiers who want a competition-inspired fit but with a more forgiving flex. With a flex of 110, you get good support and control without the boot feeling too demanding. This makes the model perfect for juniors and lighter competitive skiers who want to improve on the slopes.

The narrow 91 mm last provides low volume and a very close fit around the foot. The result is better precision and clearer contact between foot and boot. The Atomic Redster STR 3 therefore provides high control when you push the ski through the turn.

The Atomic Redster STR 3 features a World Cup Race Liner that provides a tight and precise feel. At the same time, the Ankle Retention System keeps the ankle stable in place. This creates a strong connection between the foot and the shell, which means that power is transferred more directly to the ski.

The AFS tongue can be adjusted to fine-tune the fit over the instep. Therefore, you can adjust the pressure and get a more personalized feel in the boot. The shell and cuff are made of polyurethane. Together with the STR Wall Thickness, this provides a thin but powerful construction with progressive flex.

The Race Chassis provides extra stability at the bottom of the shell. This improves both power transfer and edge grip when you push the ski. At the same time, the four-buckle system allows you to individually adjust the pressure over the foot.

Atomic Redster STR 3, Specifications

  • Last: 91 mm
  • Flex: 110
  • Weight: 2,174 / 26-26.5
  • PU
  • World Cup Race Liner
  • [Alpine Norm ISO 5355 - Type A]
  • 55mm Professional Dual Strap
  • Ankle Retention System
  • 4 buckles

Fit & last

The last is the boot’s width across the ball of the foot. 100 mm is a medium width and suits most people. If you have a wide foot or high arches, we can spot-heat the shell in the store where it presses. The boot should feel snug when you try it on: your toes touch the front when you stand straight and pull back when you bend your knees. The liner packs out 3–5 mm during the first week, so a boot that feels comfortable in the store will be too big after a week. Always measure mondopoint — boot size has nothing to do with your normal shoe size.

Boot fitting

Buy your ski boots from us and you get free boot fitting for 1 year from purchase. That means we heat-mould the liner and grind or punch the shell at no extra charge. If we need to add materials or products, such as a custom-moulded footbed, you only pay for those — not for the work. You’re welcome to drop into our store at Isaberg, Sweden for up to 1 year after your order is placed.

Shipping & returns

Delivery time: 2–5 business days to Germany, from our warehouse in Hestra, Sweden. If the boot doesn’t fit right, free boot fitting is included for 1 year from purchase. Call +46 370 33 97 70 if you’re unsure before you order.

Atomic Redster STR 3 specifications

CategoryRace ski boots
Skier levelIntermediate–Advanced
Flex110
LastNarrow (91 mm)
LinerWorld Cup Race Liner
Boot width91 mm
Weight2174 g (pair, Size 26-26.5)
ShellPolyurethane
Buckles4
DefaultISO 5355 Type A
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Choosing ski boots
Your ski boots affect your skiing more than any other piece of equipment — and they’re the hardest to choose online. Below we go through mondopoint, flex, last and what a boot fitting does.
Mondopoint — measure your foot, not your shoe size
Ski boots are sized in mondopoint, which is the length of your foot in centimetres. Stand with your heel against a wall, mark your longest toe and measure. That measurement is your size. Your EU shoe size is a poor starting point because it varies between manufacturers. A ski boot should feel snug when it’s new — the liner packs out 3–5 mm during the first week of skiing.
Flex and what the number means
Flex describes how much force it takes to bend the boot forward. 60–90 is soft and forgiving, 90–110 is an all-round level, 110–130 is stiff for skiers who ski hard, and above 130 is race level. The number isn’t standardised between manufacturers, so a 100 from one brand can feel like a 110 from another. If you’re heavy or ski aggressively, you want a stiffer boot; if you’re lighter or a beginner, you want a softer one.
Last — the width of your foot
The last is the boot’s width across the ball of the foot. Narrow is around 98 mm, medium around 100 mm and wide around 102 mm. A medium last suits most people. If you have a wide foot, a last that’s too narrow isn’t something you get used to — but the shell can be heat-moulded to make room where it’s needed.
Boot fitting makes the difference
Nine out of ten skiers have something adjusted at their first fitting. We analyse your foot, heat-mould the liner and grind or punch the shell where it pinches. A custom-moulded footbed gives better heel hold and less foot fatigue, and is the single biggest improvement you can make without changing boots. Buy your ski boots from us and free boot fitting is included (materials such as footbeds are paid separately), and you’re welcome to drop into the store for up to 1 year after your order is placed.
Socks and fit go together
A thin, knee-high ski sock with no seams across the ball of the foot is the right choice. Thick socks make the boot tighter without making it warmer — it’s the air inside the boot that insulates, and a boot that pinches gives you cold toes. Never wear two pairs.
Frequently asked questions
Ski boots are measured in mondopoint, which is the length of your foot in centimetres. Put your heel against a wall, measure to your longest toe and choose that size. The boot should feel snug when it’s new.
Ski expert
Didn’t find your answer? Call +46 370 33 97 70 or chat with a ski expert.
Atomic Redster STR 3
Select size
686 €