Therm-A-Rest Hyperion 20 UL Down Sleeping Bag
FEATHERLIGHT PACK WEIGHT AND HIGH-PERFORMANCE SLEEPING BAG
Weighing just 550 grams, the Therm-A-Rest Hyperion 20 UL Sleeping Bag is built for those who move fast and travel light through cold conditions. Designed for high-performance warmth with minimal bulk, it offers an impressive warmth-to-weight ratio for three-season missions in the mountains.
With targeted box baffled construction in key areas, it retains heat where it matters most while maintaining an ultralight feel. Premium materials and thoughtful features ensure reliable comfort without weighing you down, making the Hyperion one of the lightest bags in its class.
Storage sack and compression stuff sack included.
Explore our full range of Down Sleeping Bags here.
KEY FEATURES OF THE HYPERION 20 UL DOWN SLEEPING BAG
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Featherweight: Weighs just over half a pound, setting a new ultralight standard
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Minimal Pack Size: Packs smaller than any NeoAir® ever
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Big On Comfort: 2.5 inches (6.4 cm) of cushion for luxurious rest
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Reliable NeoAir® Construction: Triangular Core Matrix™ maximises comfort
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WingLock™ Valve: Easy inflation, quick deflation, and one-way inflation toggle
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What's Included
Storage sack and compression stuff sack
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size + Specifications
Colour: Deep Pacific
Country of Origin: China
EN Comfort Rating: 0°C (32°F) (all sizes)
EN Limit Rating: -6°C (20°F) (all sizes)
EN Extreme Rating: -23°C (-9°F) (all sizes)
Fill Material: 900 Fill Goose Nikwax Hydrophobic Down RDS
Fill Weight: Small – 0.33 kg (11.5 oz), Regular – 0.36 kg (12.5 oz), Long – 0.40 kg (14 oz)
Fits (User Height): Small – 168 cm (66 in), Regular – 183 cm (72 in), Long – 198 cm (78 in)
Width: Small – 70 cm (27.5 in), Regular – 72 cm (28.5 in), Long – 74 cm (29 in)
Length: Small – 185 cm (73 in), Regular – 203 cm (80 in), Long – 216 cm (85 in)
Girth Foot Box: Small – 102 cm (40 in), Regular – 109 cm (43 in), Long – 117 cm (46 in)
Girth Hip: Small – 123 cm (48.5 in), Regular – 126 cm (49.5 in), Long – 130 cm (51 in)
Girth Shoulder: Small – 140 cm (55 in), Regular – 145 cm (57 in), Long – 147 cm (58 in)
Height (Thickness): 4.5 in (all sizes)
Shell Fabric: 10D Nylon RipStop with DWR
Lining Fabric: 10D Nylon RipStop
Packed Dimensions: 15 x 20 cm (6 x 8 in) (all sizes)
Weight: Small – 0.55 kg (1 lb 3 oz), Regular – 0.58 kg (1 lb 4 oz), Long – 0.63 kg (1 lb 6 oz)
Zipper Side: Left (all sizes) -
What We think
The Therm-a-rest Hyperion 20F/-6C is a super lightweight sleeping bag with a -6°C EN Rating, yet it only weighs 570 grams! It is among the lightest in its class without sacrificing high-performance warmth.
- Mark Hayhurst, V+P Field Tester -
reviews
"Great bag. Used it so many times under so many conditions and has been good to minus five comfortably."
"Amazing lightweight and warm. Zipper only goes down hallway of the bag could be a deciding factor for some."
"High Quality light weight material that packs very small" -
Weight
550 g
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Fill Power
900
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Season Rating
3-Season
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Comfort Limit
-6°C
"The Valley and Peak promise is built on three pillars: thoughtfully curated gear, exceptional customer service, and a genuine love for the outdoors. As an independent, family-run business, we carefully select products from a wide variety of cottage gear brands and trusted names, ensuring that each item is rigorously tested and loved by our team. Our customer service is a cornerstone of our brand, offering personalised support to help you choose and care for your gear with confidence"
Jim De'Ath, Managing Director