Women's Trek Series

Extra warmth and space just for women

$202.30 – $237.30

Size Guide
What Is This

Sleeping Bag Temperature Ratings Explained

The EN Rating scale is a scientific test to determine the warmth of a sleeping bag. Unisex sleeping bags list the Lower Limit which is the lowest temperature rating that an average male sleeper would be comfortable in. Our women’s sleeping bags list the Comfort Limit, which is the lowest temperature rating at which an average female sleeper should be comfortable. The comfort and lower limit temperature ratings are listed in the features table on the product page.

For example, a unisex sleeping bag that shows 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. Men and women should always sleep in a layer of long underwear and use 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.

Here’s a basic categorization of appropriate use, based on rated temperatures:
Summer:   >+35ºF / +3°C
3-Season:   +10 to +35ºF / -15° to 0°C
Winter:   <10ºF / -15°C

A huge variety of factors can impact sleeping bag warmth - the above temperatures are merely guidelines, not guarantees. It’s important to think of a sleeping bag as one element in a sleep system which also includes an appropriately insulating sleeping pad and a liner. For instance - 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 nights, plus a sleeping mat with an R-Value of 2.5 to 3, and consider a Reactor thermal liner. If you have any questions about which temperature sleeping bag / R-Value sleeping mat you should select, or how to improve your warmth in a sleep system, reach out to us via our contact page any time.

$289.00 $202.30

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We've designed a down sleeping bag collection specifically for women and the Trek™ Women's Series includes two models. The women's Trek™ bags use the same 650+ loft RDS certified ULTRADRY Down™and 2D PermaShell outer fabric as the regular bags. They're cut slightly shorter and wider to incorporate extra room in the hip area, along with more down in the foot and torso areas. Additionally, we've used a layer of THERMOLITE® insulation in the foot box to keep ankles and feet toasty through the night. This versatile bag is ideal for many activities and is ready to be put to the limits during any adventure.


Packed Size Comparison

28°F: 6.0 L ≈ A large melon, but not edible
18°F: 7.0 L ≈ Two halves of a rolled yoga mat side by side


28°F: 2 lbs 3 oz ≈ A quart of cookie dough ice cream
18°F: 2 lbs 11 oz ≈ A wide mouth water bottle filled with champagne


28°F: 2.5 Season - Take this bag out late spring into early fall, no matter where you are.
18°F: 3 Season - Comfort for fall, some winter, and all of spring. Perfect for summer when used as a quilt.


Roomy, lots of room to roll, curl and adjust all night long.


  • RDS certified ULTRA-DRY Down 650+ Loft 85% Down Cluster Premium Duck Down
  • Women's specific cut: narrower in the shoulders, wider in the hip section.
  • Women's specific insulation: Extra down and a layer of THERMOLITE® in the bottom two baffles for extra warmth in the feet.
  • Will zip to any Basecamp™, Trek™, Latitude™, or Talus™ sleeping bag to form a snug double sleeping bag
  • Full-length YKK® #5 side and foot zip
  • Includes lightweight Ultra-Sil™ compression bag and a combined storage cell/laundry bag