Rossignol Comp J4 Kids Alpine Ski Boot Ski Boots - Alpine Boots - kids Rossignol
Rossignol Comp J4 Kids Alpine Ski Boot Ski Boots - Alpine Boots - kids Rossignol

Rossignol Comp J4 Kids Alpine Ski Boot

$270.00
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Description

The Rossignol Comp J4 Kids Alpine Ski Boot is a soft 50-flex junior alpine resort boot with a 100mm last, a four-buckle closure, and a warm Comfort Fit liner, built for advancing kids on lift-served terrain.
Tech Specs
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Junior Alpine (Resort) Ski Boot

Rossignol Comp J4 Kids Alpine Ski Boot

The Rossignol Comp J4 Kids Alpine Ski Boot is built for advancing juniors who have outgrown a soft beginner boot. A 100 mm junior last fits average kid feet, and the 50 flex across four buckles gives a stronger young skier something to push against on firmer snow. At 1,090 g per boot in a 23.5, with adjustable cuff catches that follow a growing calf, the Rossignol Comp J4 suits full resort days, ski team practice and faster, more confident skiing.

Expert Fit Review Fit profile and recommendations reviewed by CCBB bootfitters.

Is This the Right Boot for You?

Best For
Advancing junior skiers with average-volume kid feet who have outgrown a soft beginner boot and need a 50-flex, four-buckle resort boot with more support for faster, more confident lift-served skiing.
Consider Another Boot If
You need a touring or walk-mode boot, a heat-moldable performance liner, or a dedicated junior race boot with a narrower last and higher flex. The Comp J4 is a soft, comfort-oriented resort boot with a fixed cuff.

CCBB Boot Ratings

Uphill Efficiency
1/5
Fixed cuff, no walk mode
Downhill Performance
3/5
Soft 50 flex, more support
Walking Comfort
2/5
Rubber sole, no walk mode
Transition Speed
1/5
No walk mode to switch

Rating scale: 5 = top of its class, 4 = excellent, 3 = good, 2 = specialized or below average, and 1 = limited.

CCBB Fit Profile

Overall VolumeMedium
Toe BoxMedium-Wide
Forefoot VolumeMedium
Instep HeightMedium
Heel HoldGood
Ankle HoldModerate
PunchabilityLimited
Heat MoldableNo

Why We Like It

  • The four-buckle closure with adjustable cuff catches gives more hold and support than a three-buckle beginner boot, which advancing juniors need as they carry more speed.
  • The soft 50 flex adds support over the Comp J3's 40 flex while staying forgiving enough for a progressing skier to bend and control.
  • At 1,090 g per boot (size 23.5), the Comp J4 stays light enough for kids to manage on and off skis.
  • The Comfort Fit liner and welded sole add warmth and thermal insulation underfoot, keeping young feet comfortable through a full resort day.
  • The 100mm junior last addresses common kid fit problem areas while leaving room for growth within a size.
  • The ISO 5355 junior alpine sole drops into junior alpine bindings, and GripWalk soles are available separately if a binding calls for them.

Best Uses

  • Advancing resort skiing and building speed
  • Ski school and race-club feeder programs
  • All-day lift-served resort skiing
  • Junior skis mounted with junior alpine bindings
  • Kids with average-volume, medium-width feet

Bootfitter's Advice

The Comp J4 fits as a medium-volume junior boot on a 100mm last, a touch more supportive and secure than the wider, softer Comp J3. The four-buckle closure and adjustable cuff catches let us tune hold as a child grows within a size. We shell-fit for a modest amount of growth room rather than a tight race fit, and confirm heel hold with the buckles closed.

The Comfort Fit liner is warm but is not heat-moldable, and the junior alpine shell punches only in a limited way, so we treat the Comp J4 as a boot to size correctly rather than modify heavily. A young skier who is skiing gates or aggressively driving through this 50 flex is ready for a dedicated junior race boot with a narrower last and higher flex.

Fit profile reviewed by CCBB bootfitters. Final sizing should be confirmed with a shell fit whenever possible.

Technical Specifications Manufacturer specs · Click to expand

Fit and Construction

Weight: 1,090 g per boot (size 23.5)
Last: 100 mm (junior)
Flex: 50 (soft), Rossignol junior flex index
Range of Motion: None. Fixed cuff, no walk mode
Shell: Polyurethane shell with ALVEO bootboard
Cuff: Polyolefine cuff with adjustable catches (3 positions)

Features and Compatibility

Walk Mode: None. Fixed-cuff alpine boot
Closure: Four buckles with adjustable cuff catches
Binding Compatibility: Junior alpine bindings matched to the boot's ISO 5355 junior alpine sole. No tech inserts and no walk mode. Not a touring boot. GripWalk soles are available separately, which then require GripWalk- or MNC-compatible bindings.
Sole: Junior alpine sole (ISO 5355). GripWalk-compatible, GripWalk soles sold separately
Liner: Comfort Fit liner with welded sole (not heat-moldable)

Compare the Rossignol Comp J4

Comp J4 vs. Rossignol Comp J3

The Comp J4 is the more supportive step above the Comp J3. The Comp J4 runs a 50 flex on a 100mm last with four buckles and adjustable cuff catches, for advancing skiers carrying more speed. The Comp J3 is softer at a 40 flex on a wider 98mm last with three buckles, better for skiers still learning the basics.

Shop Rossignol Comp J3 boots

Comp J4 vs. Nordica Speedmachine J 4

Both are four-buckle junior alpine boots with ISO 5355 soles for advancing resort skiers. The Rossignol Comp J4 pairs a 100mm junior last with a warm Comfort Fit liner, while the Nordica Speedmachine J 4 is a frequent cross-shop in the same soft-flex, four-buckle junior class. Fit the child's foot shape rather than the brand.

Shop Nordica Speedmachine J 4 boots

Comp J4 vs. Lange RSJ 65

The Rossignol Comp J4 is a comfort-oriented junior resort boot with a 100mm last and a soft 50 flex. The Lange RSJ 65 sits in the same junior alpine category but carries Lange's narrower, more race-derived fit for a slimmer foot and a young skier chasing gates. Both use ISO 5355 alpine soles and junior alpine bindings.

Shop Lange RSJ 65 boots

Common Questions

Who should buy the Rossignol Comp J4 Kids Alpine Ski Boot?
The Rossignol Comp J4 suits advancing junior skiers who have outgrown a soft beginner boot and need a 50-flex, four-buckle resort boot with more support. It fits average-volume kid feet and pairs with junior alpine bindings. It is a resort boot, not a touring or dedicated race boot.
Is the Rossignol Comp J4 a touring boot?
No. The Comp J4 is a junior alpine resort boot with a fixed cuff, no walk mode, and no tech (pin) inserts. It cannot be used with pin-tech touring bindings. It is built for lift-served resort skiing on junior alpine bindings.
What is the difference between the Comp J4 and the Comp J3?
The Comp J4 is stiffer and more supportive than the Comp J3. The Comp J4 runs a 50 flex on a 100mm last with a four-buckle closure and adjustable cuff catches, while the Comp J3 is a softer 40 flex on a wider 98mm last with three buckles. Move up to the Comp J4 once a skier is confidently driving through the Comp J3.
What bindings work with the Rossignol Comp J4?
The Comp J4 ships with an ISO 5355 junior alpine sole, so it works with junior alpine bindings set up for that sole. It has no tech inserts, so it is not compatible with pin-tech touring bindings. Rossignol offers GripWalk soles separately; if you fit those, use GripWalk- or MNC-compatible bindings and have a technician confirm the setup.
What flex is the Rossignol Comp J4, and is it stiff?
Rossignol rates the Comp J4 at a 50 flex, which we consider soft in absolute terms but a clear step up from the Comp J3's 40 flex. That extra support suits an advancing junior carrying more speed, while staying forgiving enough for a still-progressing skier to bend and control.
Can I heat-mold the Rossignol Comp J4 liner?
No. The Comp J4 uses a Comfort Fit liner built for warmth and cushioning, with a welded sole for added insulation, not a heat-moldable performance liner. Fit the boot around the stock liner and size for a season of growth.
How does the Rossignol Comp J4 sizing run?
The Comp J4 fits as a medium-volume junior boot on a 100mm last. We shell-fit for modest growth room rather than converting from shoe size, and confirm heel hold with the buckles closed. Sizes run 22.5 to 26.5 Mondopoint.
How much does the Rossignol Comp J4 weigh?
The Rossignol Comp J4 weighs 1,090 g per boot at size 23.5. That keeps the boot light enough for advancing kids to manage on and off skis. Weight scales with the size run.
Does the Rossignol Comp J4 have a walk mode?
No. The Comp J4 has a fixed cuff and no walk mode. It is a resort boot that walks like any alpine boot. If you want a walk mode for touring, the Comp J4 is not the right boot.

Our Verdict

The Rossignol Comp J4 Kids Alpine Ski Boot is a supportive next step for advancing juniors. At 1,090 g per boot with a soft 50 flex, a 100mm junior last, four buckles with adjustable cuff catches, and a warm Comfort Fit liner, the Comp J4 gives a progressing skier more hold and control than a three-buckle beginner boot while staying forgiving. It is a fixed-cuff alpine boot with an ISO 5355 sole for junior alpine bindings, not a touring boot. Choose it once a young skier has outgrown the softer Comp J3, and step up to a junior race boot when they start skiing gates.

Frequently Asked Questions

What foot shape works best?

Low- to medium-volume feet with a lower instep and secure heel.
Does it punch well?

Minor boot fitting is possible, but race boots are less forgiving to modify than heavier Grilamid touring boots.