Sea to Summit Space Cowboy 45F Synthetic Sleeping Bag

Jump to: Our Verdict / Features / Specifications

The Thermarest Space Cowboy is a lightweight synthetic sleeping bag built for intense pursuits in mild temperatures. Zoned insulation makes it one of the lightest, most compact bags in it’s class.

Thermarest says

The Space Cowboy sleeping bag welcomes the idea of sleeping out under the stars with the worry-free warmth of synthetic eraLoft™ insulation. Its hollow fibers allow it to retain warmth even when wet—shrugging off morning dew and drying out super fast. Weighing less than two pounds and with a comfort rating of 45F/7C, you’ll be plenty warm all summer, whether you’re road tripping or heading deep into the backcountry. Shell and liner are made of a light and soft, GRS-certified 100% recycled nylon and an anti-snag YKK® zipper keeps them free of accidental tears. For optimal efficiency SynergyLink™ Connectors mate the bag to your sleeping pad, preventing drafts and cold spots. The precision-tuned fit makes sure you have the space you need, while eliminating unnecessary drafts and weight.

Our Verdict

If you know you are in for good weather this is an excellent summer bag, or a good bag to take travelling say, you are staying in dormitories, a refuge or youth hostel, this would be a good choice. The bag has a more generous cut than most mummy style sleeping bags, which makes it good for side sleepers. The bag also comes with newly designed straps to attach the bag to a sleeping mat, to reduce the chance of you wriggling off your mat in the night, these of course can be removed.

– Reviewed by Ultralight Outdoor Gear

Features

• High-Performance Sustainability: Shell and liner are made of a nylon that is softer to the touch, lighter than previous versions, and 100% recycled. 
• eraLoft™ Insulation: Effi cient and compressible, our water-resistant synthetic fi ll uses hollow fi bers to reduce weight without sacrifi cing warmth. 
• Redesigned SynergyLink™ Connectors: Lighter design secures the bag to a pad to increase the thermal effi ciency of your sleep system. 
• No-Fuss Zipper: YKK anti-snag zipper prevents accidental tears, making midnight ventilation and early morning exits easy. 
• Refi ned Fit: Tested and perfected in our onsite cold chamber, a roomy fi t and precise insulation distribution achieve optimal thermal effi ciency and comfort. 
• Combo stuff and storage sack included.

Specifications

Short:

• Fits: 156-168cm (5ft 1in-5ft 6in)
• Girth: 145cm at shoulder, 142cm at hip, 112cm at foot
• Fabric: 100% Recycled 20D Nylon w/ DWR / 100% Recycled 20D Nylon
• Fill: eraLoft™ Polyester Hollow Fiber
• Fill weight: 595g
• Pack size: 20 x 26 cm
• Comfort rating: 11°C / 52°F
• Comfort Limit: 7°C / 45°F
• Weight: 690g (excludes storage bags)

Regular

• Fits: 169-183cm (5ft 7in-6ft)
• Girth: 157cm at shoulder, 145cm at hip, 117cm at foot
• Fabric: 100% Recycled 20D Nylon w/ DWR / 100% Recycled 20D Nylon
• Fill: eraLoft™ Polyester Hollow Fiber
• Fill weight: 648g
• Pack size: 20 x 26 cm
• Comfort rating: 11°C / 52°F
• Comfort Limit: 7°C / 45°F
• Weight: 709g (excludes storage bags)

Long

• Fits: 184-198cm (6ft 1in-6ft 6in)
• Girth: 165cm at shoulder, 147cm at hip, 130cm at foot
• Fabric: 100% Recycled 20D Nylon w/ DWR / 100% Recycled 20D Nylon
• Fill: eraLoft™ Polyester Hollow Fiber
• Fill weight: 716g
• Pack size: 20 x 26 cm
• Comfort rating: 11°C / 52°F
• Comfort Limit: 7°C / 45°F
• Weight: 824g (excludes storage bags)

Help and advice:

• The Ultimate Guide to Lightweight Sleeping Bags
• Time-Saver Guide to Choosing a Sleeping Bag
• About Thermarest
• Thermarest Sleeping Bags Explained
• The EN13537 Standard
• All About Down
• Responsible Down Standard
• Hydrophobic Down