Altitude™ Women's Down Sleeping Bag (25°F & 15°F)

This bag can take you from sea to summit

$349.00 – $419.00

RegularRegular
LongLong
What Is This
25°F25°F
15°F15°F

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. The test produces a Lower rating (for male sleepers) and a Comfort rating (for female sleepers). Both are listed in the features table on the product page.

A unisex sleeping bag with a Lower limit of 23ºF means a man should be comfortable down to air temperatures of 23ºF. The same bag will also have a Comfort limit, in the realm of 32°F, so a woman would be comfortable down to an air temperature of 32ºF. These ratings require a sleeping mat with an R-Value appropriate for expected ground temperatures – without this, the sleeping bag itself is unlikely to keep the sleeper warm enough.

A variety of factors impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag, an appropriately insulating sleeping pad and a liner as a sleep system. For example - if you plan on sleeping in nighttime air temperatures of 27ºF / -3°C, choose a bag with a gender-appropriate rating of 23°F / -5°C, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner.

$349.00
Description

Incredibly versatile, the Altitude™ women’s down sleeping bag is snug and cozy when it’s cold outside, cool and ventilated when the weather warms, shaped to match your natural sleeping position for comfort anytime, and light enough to carry anywhere.

It could just be the perfect sleeping bag for women adventurers.

Is this women's down sleeping bag…?

  • Warm enough for shoulder seasons? Yes. The high-lofting down, cozy hood and draft collar, and extra Thermolite® insulation in the foot box provide the warmth you need for cold weather. Choose the 15°F model and pair it with a Women's Comfort Light Insulated.

  • Really cool in summer temperatures? Yes. The Free-flow zipper system means separate zippers on your left and right side and in the foot box. Open them for ventilation or turn the Altitude into a fully-flat comforter.

  • Able to be zip together with another sleeping bag? The main side zipper can be zipped to many Sea to Summit Unisex sleeping bags – Regular and Long bags have the same side zipper length.

Read up on how the shape, construction and down quality of a sleeping bag will affect how well you sleep HERE

Highlights

Best Use

  • Backpacking

Performance

  • 2.5 Season: 25°F (comfort range 25°F to 70°F)
  • 3 Season: 15°F (comfort range 15° to 60°F)

Designed to keep women warm with

  • Thermolite® insulation in the foot section warms your feet instantly
  • Down chambers filled using body-mapping to maximize warmth for a woman’s physiology
  • A wider shape between hips and knees to allow you to sleep in a natural position without compressing the down insulation and creating cold spots. 
  • Shorter overall length and narrower girth in shoulders to reduce dead space and increase thermal efficiency

Features

  • ULTRA-DRY Down 750+ Loft 90% Down Cluster Premium Duck Down certified Responsible Down Standard (RDS)
  • Thermolite® insulation in the foot section warms your feet instantly
  • Free-flow zipper system: full-length YKK® #5 main side zip, half-length opposite side zip, and foot zip provides unparalleled ventilation and use as a comforter
  • Internal pocket for phone / GPS / valuables
  • Form a snug double sleeping bag by zipping to any Ascent™, Trek™ or Traverse™ sleeping bag
  • Shaped hood, oversized draft collar, and zipper draft tube keep the cold out and the warmth in
  • Includes lightweight Ultra-Sil™ compression bag and storage cell