Cinder CdI 4°c - Lightweight Sleeping Bags (Single & Double) - Sea To Summit UK

Cinder CdI 4°c

Think outside the bag—a standalone synthetic summer quilt or extra warmth on top of your bag—your adventure, your choice

From £170.00

Please select a product option to continue

Max User Height
Regular: 183cm, Long: 196cm
Insulation Type
Compression Sack Volume
Regular: 6L, Large: 10L
20D Nano Shell & 20D Lining
Fill Power
ULTRA-DRY Down® 750+ Loft
Fill Weight
Regular: 240g, Large: 300g
Temp Rating
4°c to10°c Lowest Comfort Range
Regular: 480g, Long: 620g
Selling Price

Designed as a lightweight and packable summer quilt, our versatile 750+ Loft ULTRA-DRY Down™ Cinder Cd1 also integrates with all Sea to Summit sleeping bags (from 2021) to boost the warmth of your complete sleep system.

When the mercury climbs, treat your Cinder like a traditional quilt and allow your feet and arms freedom to cool you down. When the temperature drops, cinch the draw cords to snuggly wrap around your shoulders and create a foot pocket while securing the quilt to your mat with the simple strap and press-stud system to reduce heat loss.

Need extra versatility and warmth? Our QuiltLock™ system secures your Cinder quilt to any Sea to Summit sleeping bag for another layer of insulating down that won’t slide off in the night.

The premium 750+ Loft down is super warm and compressible and the ULTRA-DRY™ water-repellent treatment protects its loft from external moisture and condensation from inside the bag. Our ULTRA-DRY Down™ retains over 60% more loft and absorbs 30% less moisture than untreated down and it dries 60% faster.

To help combat moisture and condensation, the Cinder uses our 20D Nylon waterproof/breathable NanoShell™ fabric.

For backcountry enthusiasts not so enthusiastic about a restrictive sleeping bag, our adaptable Cinder quilts’ multiple configurations provide versatility for a wide range of temperatures and environments.

  • Adaptable set-up to suit variable conditions and environments
  • Freedom to move and ventilate when it’s warm
  • Versatile press stud and adjustable strap system secures quilt to your mat, keeping heat loss to a minimum
  • Conveniently located press studs allow quilt to be secured around neck to help trap in warmth
  • Connect two quilts together to make a double— Cinder, Glow and/or Ember Quilts
  • QuiltLock System connects your Cinder quilt to any Sea to Summit (2021 sleeping bag for extra warmth and to prevent the quilt from sliding off
  • 20D Nylon waterproof/breathable NanoShell fabric protects against wind and moisture
  • Soft touch 20D Nylon lining fabric is lightweight and breathable
  • Super-compressible RDS 750+ Loft ULTRA-DRY Down for superior insulating power
  • Sewn through quilted construction reduces weight and bulk
  • Includes a Sea to Summit Ultra-Sil™ Compression Sack and larger storage cell


Ultralight Mat

Great sleeping comfort with ultralight weight for all your night time needs.


View options

Silk Stretch Liner

The ultimate in liner comfort with ripstop silk and stretch panels.


View options

Aeros Ultralight Pillow

The Aeros™ Ultralight Pillow epitomises our design preferences for ‘light, compact and comfortable’. The result is a 20D laminated polyester  pillow with shapely support that can be packed away into a neat, small stuff sack. From the aeroplane to the mountains, the Ultralight is the perfect travel companion for those on the move. Made from 20D laminated polyester for minimal packed size and weight Curved internal baffles create contours that cradle your head Scalloped bottom edge centres pillow over your shoulders whether you’re sleeping on your back, side or upright in a chair Durable High Frequency welded construction Inflate pillow in a couple of breaths with our new patent pending mini multi-function valve Stretch knit fabric creates a more comfortable user experience


View options