Lightweight Warmth for Three-Season Adventures

The Robens Spire I -1°C Sleeping Bag is a versatile mummy sleeping bag designed for trekking, camping, backpacking, and outdoor adventures from spring through autumn.

Featuring OneThermo® synthetic insulation, a body-contoured profile, and a range of heat-retaining features, it provides an excellent balance of warmth, comfort, and packability for cool-weather nights.

Why You'll Love It

Excellent Warmth-to-Weight Ratio
→ Body-contoured mummy design reduces excess space and improves heat retention

Three-Season Versatility
→ Comfort rated to 4°C with a lower limit of -1°C

Performs in Damp Conditions
→ Synthetic insulation continues to insulate when exposed to moisture and condensation

Comfort-Focused Design
→ Soft brushed lining enhances comfort and moisture management

Packed with Practical Features
→ Compression sack, internal pocket, anti-snag zip, and hanging loops included

OneThermo® Synthetic Insulation

The Spire I uses Robens' OneThermo® insulation, providing:

• Reliable warmth in cool conditions
• Effective performance when damp
• Good loft retention
• Fast drying characteristics
• Excellent durability for regular outdoor use

Ideal for UK camping, trekking, backpacking, and multi-day adventures.

Temperature Ratings

Comfort: 4°C
Limit: -1°C

Designed for:

• Spring camping
• Summer mountain nights
• Autumn adventures
• Trekking and backpacking trips
• Cooler UK conditions

Key Features

3D Hood Profile
→ Improves warmth and comfort around the head

Redesigned Neck Baffle
→ Reduces heat loss and cold draughts

Differentiated Hood Drawcords
→ Easy adjustment by touch in the dark

Shark Fin Foot Box
→ Extra insulation around the feet

Full-Length Insulated Zip Baffle
→ Prevents cold spots along the zip

YKK Two-Way Auto Lock Zip
→ Reliable operation and ventilation options

Anti-Snag Zip Guard
→ Smooth opening and closing

Brushed Polyester Lining
→ Soft feel with excellent moisture transport

Internal Valuables Pocket
→ Secure storage for essentials

Compression Stuff Sack Included

Hanging Loops for Storage & Drying

PFAS-Free Construction

Specifications

Weight: 1450g

Packed Size: 30 × 22 cm

Shell Fabric: 50D 300T Polyester Taffeta

Insulation: OneThermo®

Lining: 230T Microfibre Polyester

Zip: YKK Auto Lock Two-Way Zip

Materials:

• Shell: 100% Polyester
• Lining: 100% Polyester
• Filling: 100% Polyester

Perfect For

• Camping
• Backpacking
• Trekking
• Bikepacking
• DofE Expeditions
• Wild Camping
• Three-Season Adventures

Robens Spire Sleeping Bag Range

Robens Spire I -1°C Sleeping Bag
→ Lightweight three-season performance

Ideal for campers and backpackers seeking warmth, comfort, and packability without excessive weight.