Leaning on over four decades' hard-earned expertise and real-world testing, Rab craft high-performance sleeping bags for the world's harshest environments.  

With 800FP down and a narrow mummy fit that eliminates excess bulk, the Neutrino 400 offers exceptional warmth for its weight, ideal for your fast and light mountain missions. It's designed with a wind-resistant outer fabric and trapezoid boxwall baffle construction, which allows the down to fully loft, eliminating cold spots and keeping you warm when the mercury drops. 

Hand-filled in the UK, the Neutrino benefits from never having had its down compressed before use, maintaining the down's loft and warmth. 

The specifics: 

• EN (13537:2012) Temperature Rating: ISO EN: Comfort: -1°C (30°F), Limit: -7°C (19°F), Extreme: -25°C (-13°F) 
• Rab Sleep Limit: -7°C (20°F) 
• Packed Size: 35cm x 23cm 
• Weight: 775g (Regular) 
• Insulation: 800FP European goose down with Nikwax fluorocarbon-free hydrophobic finish (400g) 

For a chance to win a Neutrino 400 sleeping bag, simply answer the following question.