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Sea to Summit Women's Trek WTkI Down Sleeping Bag

SKU# STS_10679

The women's specific Trek WTkI sleeping bag is the perfect compromise between comfortable roomy bags and warm trim fit mummy bags for summer camping and adventure travel. It features a 3 dimensional hood, ULTRA-DRYDown™ 650+ loft responsibly sourced duck down, two zips that allow you to open the bag like a duvet and two baffles under the foot area that combine down and THERMOLITE® to keep your heels and ankles warmer where feet compress the down.

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  • Tapered rectangular shape offers a good compromise between the comfort of a generous cut shape and the warmth of a closer fit
  • 3D hood
  • 2D PermaShell™ DWR shell fabric
  • Soft touch lining fabric is down proof by construction and highly breathable offering a comfortable sleep
  • 650+ loft power
  • 60 upper / 40 underside fill ratio
  • Differential cut shell with 3D side walls, a feature normally reserved for technical alpine sleeping bags, provides more space for the down to loft right to the edge of the bag
  • Sewn through baffles on the base of the bag
  • Combined down and THERMOLITE® baffles under the foot area to keep your heels and ankles warmer where your feet compress the down
  • Side block baffle
  • Zip draft tube with anti-snag
  • Cushioned internal hood drawcord with dual adjustment for a comfortable seal around your face
  • 2 way YKK #5 zips with separate foot zip - allows you to open the bag into a duvet
  • Large sized internal zip pocket inside the chest area to store valuables like a passport and wallet or electronic devices
  • Includes a lightweight Ultra-Sil® compression bag (volume 10 to 3.3 litres) and a storage cell


Fits to 170cm
Shoulder Width 74cm
Foot Width 49cm
Compression Compressed volume: 6 litres
Fill ULTRA-DRYDown™ 650+ Loft 85% Down Cluster Premium Duck Down
Fill Weight 500g
Average Weight 990g
Temperature Rating minus 2°C Comfort level for women
Made From 2D PermaShell, 33D nylon with DWR, 342T high-density down proof weave


2D PermaShell™ Fabric is an extremely breathable, water-repellent 33-denier nylon with a DWR (durable water resistant) finish. This material is highly vapour permeable and down proof by construction therefore it does not rely on coatings that reduce breathability and add weight.

ULTRA-DRYDown™: is a permanent (no loss of treatment effect has been seen in over 14 wash cycles) Nano-level water repellent polymer treatment applied to Sea to Summit high loft, high quality down. The Nano-thin treatment vastly improves the down's reaction to water without effecting its weight or loft performance. ULTRA-DRY Down™ retains over 60% more loft and absorbs 30% less moisture when compared with untreated down. Sea to Summit sleeping bags dry out 60% faster than bags with untreated down.

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