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Meet the Beneunder AirBloom 4.0 Stretch Puffer — engineered for warmth, mobility, and outdoor performance. With 360° stretch insulation and a three-layer heat-storage system, this jacket locks in warmth while keeping you light and flexible. Designed to resist damp chill, it ensures comfort in temperatures from 5°C to 15°C.
Highlights：
- 360° elastic insulation with 110% stretch
- Heat-storage layers outperform 800-fill down
- +7.5°C warmth boost, 39.8% better heat retention
- Moisture-resistant, won’t clump in rain
- Lightweight design, only ~530g & 1.3cm thin
Woven fabric: 87% Nylon, 13% Spandex – durable and flexible, offering wind resistance with comfortable stretch.
Knitted fabric & knitted lining: 70% Nylon, 30% Spandex – smooth and high-stretch, ensuring comfort and ease of movement.
Woven lining, pocket lining & filling: 100% Polyester – soft, breathable, and easy-care, with lightweight insulation that provides warmth without bulk.
• Free Shipping on all orders.
• 30-day Return: Feel free to send your item back within 30 days of receiving the product.
You can review our shipping and returns policy here.
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 Warmth — Beyond Down’s Limits
The AirBloom 4.0 insulation stretches up to 110%, adapting to every movement without restriction. Unlike stiff down fillings, it keeps you warm and flexible whether you’re running, climbing, or stretching outdoors.
Triple Heat-Storage System — Warmer Than 800-Fill Down
With a three-layer system (heat-storage, insulation, and heat-release), this jacket locks in warmth more effectively than 800-fill down. It delivers up to +7.5°C of added warmth and 39.8% better heat retention in cold weather.
Moisture-Resistant Warmth — No Clumping, No Chill
AirBloom fibers repel water and resist clumping, maintaining warmth even in damp, rainy weather. Tested to stay dry and fluffy where down loses insulation.
FlowWarm Venting — Sweat Out, Stay Warm
Strategically placed breathable panels wick away sweat within 1 second and help regulate body heat. Perfect for high-movement zones like underarms, elbows, and back.
Lightweight Shield — Built for Every Journey
Weighing just ~530g and measuring 1.3cm thin, this jacket is lighter and slimmer than traditional down. With Wind-Go shell fabric, it blocks wind and drizzle while remaining easy to pack and wash.