The Sea to Summit Spark Pro 900+ Down Sleeping Bag -9°C | 15°F – RDS – Regular is engineered for colder 3-season to alpine conditions while maintaining exceptional ultralight performance. Featuring 900+ fillpower RDS-certified goose down with Ultra-Dry treatment, it delivers outstanding loft and thermal efficiency. The 10D shell and liner reduce weight without compromising breathability, while the Free-Flow Zip system enables adaptable ventilation and full quilt conversion when needed.

Sea to Summit Spark Pro 900+ Down Sleeping Bag -9°C – Regular Key Features:

• Cold-weather rating: ISO lower limit of -9°C for dependable insulation in cooler climates.
• Premium 900+ fillpower down: Maximum warmth-to-weight performance.
• Non-PFAS Ultra-Dry Down: Improved moisture resistance and loft retention.
• Advanced baffle construction: Vertical chest baffles and horizontal lower baffles prevent down migration.
• Free-Flow Zip system: YKK #5 side zip with additional shoulder and footbox zips.
• Generous mummy shape: Improved comfort without unnecessary bulk.
• Front draft collar: Oversized shoulder fit enhances heat retention.
• Sea to Summit Lifetime Guarantee: Built for long-term reliability.

Specifications – -9°C Regular

• Best Use: Ultralight Backpacking
• Performance: Cold / 3 Season
• ISO Lower Limit: -9°C
• Women's ISO Comfort: -3°C
• Weight: 784g
• Fill Weight: 480g
• Compressed Volume: 7L
• Compression Sack: 13L included
• Fits Up To Height: 185 cm

Designed for colder backcountry missions, the -9°C Spark Pro Regular balances serious insulation with ultralight packability and ventilation control.