SIMOND10°C Lightweight Down Trekking Sleeping Bag

About

Whether you're conquering a mountain pass or hunkering down at a remote bivvy spot, the Simond MT900 is the sleeping bag that won't let you down. Designed in the French Alps and filled with RDS-certified 90% grey duck down boasting an impressive 800 CUIN fill power, this two-season bag keeps you comfortably warm at temperatures of 10°C and above while tipping the scales at a barely-there 700g. It compresses into a stuff bag barely bigger than a water bottle, so it disappears into your pack without eating into your kit allowance. The mummy shape and anatomical hood lock in warmth without wasted air space, and the water-repellent shell means a light drizzle won't ruin your night's sleep. Backed by a 5-year warranty and free from any intentionally added PFAS treatments, the MT900 is the kind of gear that serious trekkers buy once and rely on for years.

Product Features

• 800 CUIN Ethical Down Fill: A 90/10 grey duck down and feather blend with an 800 CUIN fill power delivers exceptional warmth-to-weight performance, trapping more air and providing superior insulation compared to lower-grade fills.
• Ultra-Lightweight and Compressible: At just 700g (size L) and packing down to 4.9 litres, this bag is built for those who count every gram and every centimetre of pack space.
• Mummy Shape with Anatomical Hood: The close-fitting mummy cut minimises dead air space to maximise heat retention, while the adjustable drawstring hood ensures your head stays warm on cold nights.
• Water-Repellent Outer Shell: The polyamide shell is treated so water beads and runs off the surface, offering a layer of protection against light moisture and condensation.
• Double-Slider Zip with Heat Baffle: The long left-hand zip features a double slider for easy ventilation control, and a zip baffle prevents heat from escaping through the seam.
• RDS-Certified Filling: The Responsible Down Standard (RDS) certification ensures the down and feathers used in this bag are ethically sourced.
• PFAS-Free Construction: No intentionally added PFAS chemical treatments means this bag is a cleaner choice for you and the environment.
• 5-Year Warranty: Simond backs this bag with a 5-year warranty against manufacturing defects, giving you long-term peace of mind on every adventure.

Product Specifications

• Comfort Temperature: 10°C
• Limit Temperature: 5°C
• Fill Power: 800 CUIN
• Fill Composition: 90% Grey Duck Down, 10% Grey Duck Feather
• Shell Material: 100% Polyamide
• Lining Material: 100% Polyamide
• Shape: Mummy
• Zip: Single long zip, left side, double slider
• Size S: 560g | Up to 1.59m | Ø12 x 34cm | 3.5L | 260g down/feathers
• Size M: 620g | 1.60m to 1.69m | Ø13 x 34cm | 4.2L | 260g down/feathers
• Size L: 700g | 1.70m to 1.84m | Ø14 x 34cm | 4.9L | 300g down/feathers
• Size XL: 780g | 1.85m to 2.00m | Ø15 x 34cm | 5.6L | 340g down/feathers
• Shoulder Width: 73cm (size L)
• Warranty: 5 years

What's in the Box?

• 1 x Simond MT900 Down Sleeping Bag
• 1 x Stuff Bag