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Ember Ultralight Down Quilt (50°F, 35°F & 25°F)


$289.00 – $439.00

Quilt Temperature Ratings Explained

Unlike sleeping bags, which can be tested using a European Norm (EN) or ISO test protocol, there is no standard for temperature testing of quilts.

All quilt temperature ‘ratings’ are therefore estimates.

Sea to Summit calculates temperature recommendations for quilts based on the weight of down or synthetic-fill used, compared to a similar Sea to Summit sleeping bags. This information is presented using the following icon:

Quilt Temperature Rating

The Lowest Comfort Temperature is the lowest temperature at which we believe an average sleeper will still sleep comfortably. The Functional Limit is the lowest temperature at which a quilt could be used – it is below the threshold of what most users would regard as comfortable.

These recommendations assume a sleeping mat with a tested R-Value appropriate for expected ground temperatures – without this, the quilt itself is unlikely to keep the sleeper warm enough.

A variety of factors impact the warmth of a sleeper - the above temperatures are merely guidelines, not guarantees. It’s important to think of a quilt, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 37ºF / 3°C, you should use a quilt with a Lowest Comfort Temperature of 40°F / 4°C, plus a sleeping mat with an R-Value of 2 to 3 (or higher), and consider a Reactor thermal liner.


An Ember quilt can be an ideal option for bikepackers, ultralight hikers and travelers.

A well-constructed quilt means freedom: Freedom from the weight of a sleeping bag zipper; freedom from the constrictive shape that comes with some sleeping bags.

The Ember™ Series takes the simplicity of the quilt concept a step further. The high quality 850+ loft Ultra-Dry Down and 10 D outer / 7D inner shell material mean incredibly lightweight and tiny packed size. The snap-on attachment straps keep your quilt located on your sleeping mat, while the drawcord base of the 50°F and 35°F give the Ember a ‘shape-shifter’ function: wider at the base for more freedom of movement when it’s warm, snugged down when it’s cooler.

Technical Features

850+ Loft Ultra-Dry Down™

The highest-lofting down used in any of Sea to Summit’s sleeping bags. 850+ Fill Power indicates that one ounce (30g) of down will re-expand to over 850 cubic inches after compression. Higher loft means that less down can be used to achieve the same temperature rating – important for performance sleeping bags. The loft and down quality/composition are independently tested by the International Down and Feather Laboratory (IDFL) – a copy of the certification is supplied with every Sea to Summit sleeping bag.


The down is responsibly sourced and RDS certified and treated with the environmentally-friendly Ultra-Dry Down™ treatment.


All of which means you can rest easy.

Responsible Down Standard (RDS)

All Sea to Summit sleeping bags use only down which is certified according to the Responsible Down Standard. The RDS is helping shift the entire down and feather industry towards more humane animal rearing and handling practices. Overseen by the industry leading Textile Exchange, the RDS requires independent, third-party assessments of all aspects of animal rearing and handling throughout the entire supply chain. By using only down that meets the audited requirements of the RDS, we can have confidence that each phase of the collection process has been completed with the welfare and ethical treatment of waterfowl in mind.

To learn more about RDS, visit

UL 10 Denier Nylon

Despite being incredibly lightweight, the 10 Denier UL Nylon is down-proof and surprisingly durable. A DWR finish helps to shed external moisture. This fabric is part of the secret to making the Spark and Flame Down Sleeping Bag Series some of the lightest, most packable sleeping bags available today.

Tech Specs

Product Details

Best Use
Ultralight Backpacking
Comes With
Water-resistant Ultra-Sil™ Compression Sack and Storage Cube
Ultra-Dry Down™ 850+ Loft
Shell Fabric
Ultralight 10D Nylon Shell
ember-ultralight-down-quilt-50-f-35-f-25-f-regular.svg ember-ultralight-down-quilt-50-f-35-f-25-f-large.svg
Ember I
14.6 oz / 415 g
1.8 L
XXS - 3.3 L to 1.3 L
8 oz / 220 g
6 ft / 183 cm
5 x 6 in / 12 x 15 cm
Warm Weather
40ºF - 50ºF
Ember I
1 lb 3 oz / 544g
2.7 L
XXS - 3.3 L to 1.3 L
9.5 oz / 270 g
6 ft 4 in / 192 cm
5 x 7 in / 13 x 18 cm
Warm Weather
40ºF - 50ºF
Ember II
1 lb 4 oz / 560g
3.7 L
XS - 6 L to 2 L
12 oz / 350 g
6 ft / 183 cm
6 x 7 in / 15 x 18 cm
2 Season
25ºF - 35ºF
Ember II
1 lb 9 oz / 718 g
4.9 L
XS - 6 L to 2 L
15 oz / 420 g
6 ft 4 in / 192 cm
6 x 8 in / 15 x 20 cm
2 Season
25ºF - 35ºF
Ember III
1 lb 11 oz / 757g
5.4 L
S - 10 L to 3.3 L
17.5 oz / 500 g
6 ft / 183 cm
7 x 8 in / 18 x 20 cm
2.5 Season
14ºF - 25ºF
Ember III
2 lbs 2 oz / 970 g
6.8 L
S - 10 L to 3.3 L
20.5 oz / 580 g
6 ft 4 ft / 192 cm
7 x 9 in / 18 x 23 cm
2.5 Season
14ºF - 25ºF


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