Thermarest Vesper 45 UL Down Quilt

7°C Comfort Limit (EN13537:2012) 175g of 900 Fill Power Nikwax Hydrophobic Down (US Method)
Weighs 408g (Regular bag)
Code: SS20540V
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The Thermarest Vesper 45 UL is an ultralight backpacking quilt for summer thru hiking. It's the lightest option in the top-rated Vesper quilt line.

Thermarest says:

For the lightest possible pack, we crafted the Vesper 45F/7C to deliver the essential warmth needed for mild-weathered pursuits. To keep it light, we used powerful 900 fill Nikwax Hydrophobic Down certified by the Responsible Down Standard. Designed with high-quality materials and Therm-a-Rest performance features like SynergyLink™ connectors, a snap neck closure, perimeter side baffles and an insulated footbox provide warmth and comfort in the backcountry. When compared to sleeping bags, the Vesper quilts save weight and pack smaller by utilizing the warmth of your insulated pad. Storage sack and compression stuff sack included.

We're working out what we think about Therm-a-Rest's Vesper 45 UL Down Quilt, we'll add our comments here in due course.

- Reviewed by Ultralight Outdoor Gear

Help and advice:Choosing a sleeping bag advice
 EN 13537 rating for sleeping bags explained
 Sleeping bag shape and sizes advice
 Sleeping Bag features Page 1
 Sleepin bag features page 2
 All about down filling in sleeping bags
  • 900 fill Nikwax Hydrophobic Down™: Absorbs 90% less water and dries 3 times faster without using dangerous PFCs.
  • Unrivaled Packability: Lightweight materials and precise design pack into a minimalist compression sack.
  • SynergyLink™ Connectors: Integrate the quilt with a pad for optimal efficiency and comfort; removable for versatility.
  • Draft Protected: Perimeter side baffles and snap neck closure eliminate unwanted drafts.
  • Responsible Down Standard Certified: Certification that ensures that the waterfowl in the down supply chain are treated humanely.
  • Compression sack and storage sack included

Temperature Rating

  • EN13537:2012 Comfort: 11°C / 52°F
  • EN13537:2012 Comfort Limit: 7°C / 45°F


  • Weight: 408g (excludes bags)
  • Fits: 183cm / 6ft
  • Shoulder girth: 147cm / 58in
  • Hip girth: 130cm / 51in
  • Footbox girth: 46cm / 18in
  • Fill weight: 175g
  • Packed dimensions: 11 x 13cm / 4.5 x 6in


  • Weight: 410g (excludes bags)
  • Fits: 198cm / 6ft 6in
  • Shoulder girth: 155cm / 61in
  • Hip girth: 137cm / 54in
  • Footbox girth: 48cm / 19in
  • Fill weight: 205g
  • Packed dimensions: 11 x 13cm / 4.5 x 6in


  • Shell: 10D Nylon Ripstop w/DWR 10D Nylon
  • Lining: 10D Nylon
  • Insulation: 900 fill Goose Nikwax Hydrophobic Down, RDS
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