The Astro Pro professional down sleeping bag is the ultimate choice for climbers, whether you're in the tent or camping under the open sky. With an inner shell that expands up to 25% in width, it wraps snugly around you. There's ample space that effectively traps warmth, and the innovative three-dimensional foot box ensures your feet stay cozy with freedom of movement. Every Astro Pro model meets bluesign® standards and features certified down (RDS).

Best for

Camping / Backpacking (3 out of 5) Trekking (4 out of 5) Multi-day trips (5 out of 5) Adventures (5 out of 5)

Highlights

• Two-way zipper
• Inside Thermo Stretch Comfort seams
• Contoured ThermoHood
• Inner pocket for storing valuables
• PowerBox design
• Dryzone: water-resistant fabric at head and foot areas
• Insulating collar
• Trapezoidal chamber design to minimize cold spots
• Easy-adjust contrasting drawcord toggles for the hood in low light
• Storage bag included
• Anti-snag zipper guard
• SL Sleeping Bag
• Lightweight, compressible stuff sack
• ErgoFootPro: ergonomic 3D footbox for extra space
• Green Button certified
• Bluesign® certified
• PFAS free
• Animal welfare certified

Specifications

Suitable for Three Seasons +2° C Comfort The comfort temperature is determined by the lowest point at which an ‘average’ woman (25 years old, 60 kg, 160 cm) can sleep comfortably in a relaxed position. This range provides a pleasant sleep even for beginners. -4° C Limit The limit temperature indicates the lowest point for an ‘average’ adult man (25 years old, 70 kg, 173 cm) to sleep comfortably while relaxed. An experienced user can maximize insulation by dressing appropriately and other factors. -21° C Extreme The extreme temperature is a survival rating for an ‘average’ adult woman, where sleeping isn't possible, but survival for six hours is achievable without hypothermia. Note that other risks such as frostbite still exist. tested according to ISO EN 23537

Key features of the Astro Pro 400 SL

Spacious and warm Eco-friendly Compact storage sack Cozy with 360° fill system

Spacious and warm

The lining stretches sideways up to 25%, cleverly contoured to your body's shape. This design enhances spaciousness while effectively trapping warmth. Its three-dimensional, ergonomic footbox offers exceptional insulation around your feet while allowing room to move.

Eco-friendly

ECO-FRIENDLY: The lightweight Astro Pro down sleeping bag is a bluesign^® product, crafted under strict environmental and social responsibilities for minimal impact on our planet and its people – allowing you to sleep soundly with a clean conscience. We exclusively use down that complies with the Responsible Down Standard (RDS).

Compact storage sack

This lightweight compression stuff sack utilizes a new lateral compression method for efficient packing. It compresses the bag for easy stowage in your pack, though we recommend storing your sleeping bag loose in the mesh storage sack.

Cozy with the 360° fill system

COZY: Featuring a 360° fill system with consistent fill and design on both top and bottom, sleep comfortably in any position, eliminating a chilly back.

SL Sleeping Bag

The tailored size and shape ensure no excess air needs to be warmed up. Deuter's REGular models cater to those around 185 cm tall. Those of larger builds can opt for L versions, designed for individuals up to roughly 200 cm.

The shorter SL Women’s Fit options provide a narrower cut at the chest and feet with a higher down filling for their size, making them ideal for women up to 175 cm tall.

Green Button certified

The certification label promotes sustainable textiles and is supported by the government. If you want socially and environmentally sustainable apparel, look for the Green Button. It's unique in requiring compliance with substantial standards for safeguarding people and the environment. A total of 46 exacting social and environmental criteria must be followed, from water management to labor rights.

bluesign® product

Goods bearing the bluesign® product label meet stringent safety and environmental benchmarks. The production of materials and accessories for bluesign® approved items is done resource-efficiently, reducing adverse effects on people and ecosystems.

PFAS free

This deuter item is free from intentionally added PFAS (per- and polyfluorinated chemicals). Deuter minimizes the use of potentially harmful substances to the planet and health.

In outdoor gear, PFAS is typically applied for water-repellent functions.

Instead, deuter has been using an alternative DWR (Durable Water Repellency) treatment since 2019.

Certified Animal Welfare

• No live plucking
• No forced feeding
• Supply chain traceability
• Oversight by independent certification organizations worldwide
• Animal welfare assurance across all levels

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