Mountaineering Sleeping Bag

• Insulation: 100% polyester synthetic fill, with a 100% polyester shell
• Manufacturer temperature rating: -2°C (2000g), -7°C (2500g), -12°C (3000g)
• Internal dimensions 220 x 85 cm, roomy rectangular cut
• Three fill weights to choose from: 2000g, 2500g and 3000g
• Colours: Beige or Brown
• Differentiated channel construction spreads the fill for even heat
• Dispatched after 3 to 5 business days of processing, delivered within 10 to 20 business days

Synthetic warmth for high, cold nights

The Mountaineering Sleeping Bag runs on a 100% polyester fill rather than down, which is the sensible choice for damp British and alpine conditions: synthetic keeps insulating when it picks up moisture and dries faster than feathers. You pick the weight to match the trip, from the lighter 2000g bag for milder cold down to the 3000g version for the deep end. The rectangular cut gives you room to move instead of pinning your shoulders.

Read the rating honestly

The maker rates this bag from -2°C to -12°C depending on the weight you choose. Treat those figures as the cold edge, not the number you sleep comfortably at, since sleeping bag ratings across this category tend to run optimistic. Aim a few degrees warmer than the printed rating, and add a liner when the forecast turns hard. The differentiated channel construction spreads the fill evenly so you avoid cold spots down the length of the bag.