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Meet the Beneunder AirBloom 4.0 Sport Jacket — built for dynamic warmth, sweat control, and all-direction stretch. Designed for outdoor workouts in 5–15°C, it keeps you warm without bulk and flexes effortlessly with every move. The FlowWarm system wicks sweat in 4 seconds, while Wind-Go fabric shields from wind and drizzle. Lightweight at ~300g and only 1.3cm thin, it’s your zero-burden performance layer.
Highlights:
- 360° stretch insulation with 110% elasticity
- Warmer than 800-fill down: +7.5°C boost, +39.8% retention
- Sweat-wicking FlowWarm panels, dries in 4 seconds
- Moisture-resistant, won’t clump even in damp cold Ultra-light: ~300g, ~1.3cm, packable and machine washable
Fabric: 87% Nylon, 13% Spandex – durable, flexible, and weather-resistant for outdoor performance.
Side panels & under sleeves: 79% Polyester, 21% Spandex – breathable and stretchy, enhancing mobility and comfort.
Lining / pocket lining / inner collar: 100% Polyester – soft, smooth, and easy-care, ensuring lasting comfort.
Filling: 100% Polyester – lightweight insulation for reliable warmth without bulk.
Based on moderate activity with a basic inner layer; increase warmth for wind or humidity.
Recommended range: 5–15°C / 41–59°F
360° Elastic Freedom — Beyond Down’s Limits
The AirBloom 4.0 insulation stretches up to 110%, keeping pace with every stride, stretch, or climb. Where down feels stiff and restrictive, this jacket moves with you — no pull, no bulk.
Triple Heat-Storage Layers — Warmer Than 800-Fill Down
With a unique three-layer system — locking, insulating, and heat-releasing — AirBloom 4.0 boosts warmth by up to +7.5°C, delivering 39.8% stronger heat retention than premium down.
FlowWarm Venting — Sweat Out, Stay Warm
Breathable panels at high-movement zones (underarms, elbows, back) wick sweat within 4 seconds, preventing damp chill and keeping your core dry through long runs or climbs.
Moisture-Resistant Warmth — No Clumping in Damp Cold
Unlike down, AirBloom fibers repel moisture and resist clumping, keeping insulation intact even in wet, foggy, or rainy weather. Tested at just 0.3% regain rate for stable warmth.
Feather-Light Shield — Comfort Without Weight
At ~300g and just 1.3cm thin, this jacket delivers serious warmth with zero bulk. Wind-Go shell fabric blocks wind and drizzle, while the packable, machine-washable build makes it easy for daily training or travel.
Stowable Hood — Weather Protection On Demand
Designed with a four-snap stowable hood, it shields you from wind and cold when needed, and folds away neatly when not in use. No bulk, no hassle — just practical flexibility for changing conditions.