RAB

RAB Ascent Pro 800 - Long Left Zip

Q: Should I choose a down or synthetic sleeping bag?

Blog - How to choose a sleeping bag The right choice depends on how you camp. Down is lighter and warmer for its weight. Synthetic is better in wet conditions and usually cheaper. Which sleeping bag is best for hiking? Down sleeping bags are best for hiking because they’re lighter and pack smaller, making them easier to carry long distances. Which sleeping bag is better in wet weather? Synthetic sleeping bags are better in wet conditions because they still insulate when damp. Wet down doesn’t. Is a heavier sleeping bag warmer? Generally, yes. A heavier sleeping bag is usually warmer, regardless of whether it’s down or synthetic. Are synthetic sleeping bags better value? Yes. If you’re driving to camp and not carrying it far, synthetic sleeping bags usually give better warmth for the price. Which sleeping bag is easier to look after? Synthetic sleeping bags are easier to clean and maintain. Down needs more care. Quick answers Hiking and light packs: Down Car camping or wet weather: Synthetic Easy care and better value: Synthetic No bad options. Just different trade-offs — and fewer regrets at 3am.

$451.00

~~$851.00~~ $451.00

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Warm and protective, the Ascent Pro 800 is ideal for Scottish and Scandinavian winter conditions. It has a generous wide fit, ensuring a comfortable night’s sleep for the weary mountain explorer. Filled with 800g of 650FP duck down, it is a very warm sleeping bag, with space to wear extra, bulkier layers inside if using in seriously cold temperatures.

With Pertex® Quantum Pro wind and water resistant outer and hydrophobic duck down, it copes well with wind, condensation, and damp conditions, ideal for snow holing or an exposed bivi ledge. Warm enough to deal with plummeting temperatures it’s a great all-round adventure, winter sleeping bag. Built with trapezoid shaped, boxwall baffles that stack neatly together, the down inside is encouraged to fully loft, maximising insulation and reducing the appearance of cold spots. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, maintaining the down’s loft and warmth.

The Ascent Pro has a ¾ length main zip with a down filled internal baffle and 3D shaped neck baffle, both designed to limit any heat escaping. There’s a zipped pocket inside, ideal for stashing your headlamp within easy reach, and with its angled foot box you can be sure of comfy position to sleep. Exploring with a partner or want extra space? Pick up a left and a right zipped bag and you can zip them together.

The Specifics

Rab Sleep Limit:Rab Sleep Limit: -15°C (5°F)
Weight:(Regular) 1430g/50.4oz, (Long) 1510g/53.3oz
Product Code:QSD-25
20D Pertex® Quantum Pro ripstop (36gsm) with fluorocarbon-free DWR
Lining: 20D Recycled Nylon (38gsm)
650FP European Duck Down with Nikwax Fluorocarbon-Free Hydrophobic Finish (800g / 28.2oz)
Trapezoidal boxwall construction with differential cut, to maximise loft and warmth
3-dimensional shaped neck collar to seal in warmth
Pertex Quantum Pro neck baffle fabric for better moisture management
YKK 3/4 length main zip with down filled baffle to trap warmth
YKK Anti-snag zip insert and anti snag internal zip guard
YKK zipped internal stash pocket
Angled foot box for relaxed sleeping posture
Drawcord stuffsack included
Zipped cotton sack with water-resistant base for home storage
Outer: 100% polyamide with polyurethane coating. Lining: 100% recycled polyamide
Wide mummy shape

Rab Sleeping Bag Size Chart

Tapered Mummy Models

	Regular	Long	Wide	Long Wide
Sleeping Bag Length	215cm / 84.6in	230cm / 90.6in	215cm / 84.6in	230cm / 90.6in
Max User Height	185cm / 72.9in	200cm / 78.7in	185cm / 72.8in	200cm / 78.7in
Internal Shoulder Girth	160cm / 63.0in	162cm / 63.8in	180cm / 70.9in	182cm / 71.7in
Internal Hip Girth	134cm / 52.8in	136cm / 53.5in	146cm / 57.5in	148cm / 58.3in
Internal Foot Girth	102cm / 40.2in	104cm / 40.9in	110cm / 43.3in	112cm / 44.1in

FAQs

Should I choose a down or synthetic sleeping bag?

Blog - How to choose a sleeping bag

The right choice depends on how you camp.
Down is lighter and warmer for its weight.
Synthetic is better in wet conditions and usually cheaper.

Which sleeping bag is best for hiking?
Down sleeping bags are best for hiking because they’re lighter and pack smaller, making them easier to carry long distances.

Which sleeping bag is better in wet weather?
Synthetic sleeping bags are better in wet conditions because they still insulate when damp. Wet down doesn’t.

Is a heavier sleeping bag warmer?
Generally, yes. A heavier sleeping bag is usually warmer, regardless of whether it’s down or synthetic.

Are synthetic sleeping bags better value?
Yes. If you’re driving to camp and not carrying it far, synthetic sleeping bags usually give better warmth for the price.

Which sleeping bag is easier to look after?
Synthetic sleeping bags are easier to clean and maintain. Down needs more care.

Quick answers
Hiking and light packs: Down
Car camping or wet weather: Synthetic
Easy care and better value: Synthetic

No bad options. Just different trade-offs — and fewer regrets at 3am.