-18°C Rated
Pertex® Quantum shell
Rab Ascent Down Sleeping Bag -18°C full length view, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C hood detail, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C stuff sack with Rab logo, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C compressed in stuff sack, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C compressed in stuff sack, Tempest Blue
1 5
Rab Ascent Down Sleeping Bag -18°C full length view, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C hood detail, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C stuff sack with Rab logo, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C compressed in stuff sack, Tempest Blue
Rab Ascent Down Sleeping Bag -18°C compressed in stuff sack, Tempest Blue
Rab

Ascent Down Sleeping Bag (-18°C)

€450.00
Size: Size chart
Rab Size Guide – Great Outdoors
greatoutdoors Rab Size Guide
Rab® — Size Guide

Find Your Rab Size

All measurements are body measurements in centimetres (cm). Use the charts below for Men's and Women's clothing, gloves and hats.

Men's Clothing
All measurements are body measurements in cm. Jackets for extreme conditions are cut slightly more generous to accommodate thicker midlayers.
Tip: If between sizes, go up to the larger size. For expedition or alpine jackets designed for use with heavy midlayers, consider your intended layering when choosing — you may prefer a size down if wearing fewer layers beneath.
Men's Jackets & Tops (cm)
Size Chest (cm) Waist (cm) Arm Length (cm)
XXS 86 68.5 81
XS 90 71 83
S 94 76 83
M 102 81 86
L 109 86 89
XL 117 91 91
XXL 122 96 91
Men's Legwear — Waist & Inseam (cm)
Size Waist (cm) Inseam Short (cm) Inseam Regular (cm) Inseam Long (cm)
XS 71 71 81 86
S 76 71 81 86
M 81 71 81 86
L 86 71 81 86
XL 91 71 81 86
XXL 96 71 81 86

How to Measure — Men's Clothing

1
ChestMeasure the full circumference of your chest just below your armpits, keeping the tape horizontal.
2
WaistFind the top of your hip and measure the full circumference around your body at that point.
3
Arm LengthMeasure horizontally from the centre of your back, across the shoulder, over a naturally bent elbow and down to the wrist fold.
4
Inside LegMeasure from your crotch to the base of your ankle while standing straight.
Women's Clothing
All measurements are body measurements in cm. Jackets for extreme conditions are cut slightly more generous to accommodate thicker midlayers.
Tip: If between sizes, go up to the larger size. For expedition or alpine jackets designed for use with heavy midlayers, consider your intended layering — you may prefer a size down if wearing fewer layers beneath.
Women's Jackets & Tops (cm)
Size Chest (cm) Waist (cm) Hip (cm) Arm Length (cm)
XS 84 69 90 77.5
S 89 72 95 79
M 94 76 100 81
L 99 81 105 84
XL 104 86 110.5 86
Women's Legwear — Waist & Inseam (cm)
Size Waist (cm) Inseam Short (cm) Inseam Regular (cm) Inseam Long (cm)
XS 69 71 79 84
S 72 71 79 84
M 76 71 79 84
L 81 71 79 84
XL 86 71 79 84

How to Measure — Women's Clothing

1
Chest / BustMeasure the full circumference of your chest just below your armpits, keeping the tape horizontal.
2
WaistFind the top of your hip and measure the full circumference around your body at that point.
3
HipMeasure around the widest part of your hip area, keeping the tape horizontal.
4
Arm LengthMeasure horizontally from the centre of your back, across the shoulder, over a naturally bent elbow and down to the wrist fold.
5
Inside LegMeasure from your crotch to the base of your ankle while standing straight.
Gloves & Mitts
Hand circumference and hand length in centimetres (cm). Measure your dominant hand. If between sizes, size up.
Tip: Always measure both hand circumference and hand length, and use the larger of the two to determine your size. For liner gloves, consider sizing down for a snug fit.
Gloves & Mitts Size Chart (cm)
Size Hand Circumference (cm) Hand Length (cm)
S 18–19 16.5–18
M 20–21.5 19–20
L 23–24 21.5–23
XL 24–25.5 23–24

How to Measure — Gloves

1
Hand CircumferenceMeasure the circumference around the fullest part of your hand — around the knuckles, excluding the thumb. Keep fingers relaxed.
2
Hand LengthMeasure from the base of your wrist to the tip of your middle finger in a straight line.
3
Use the Larger SizeIf your circumference and length measurements suggest different sizes, always use the larger of the two for the best fit.
4
Between Sizes?Go up to the next size for a more comfortable fit. Gloves that are too tight restrict blood flow and reduce warmth.
Hats & Caps
Head circumference in centimetres (cm), measured around the widest part of the head just above the eyebrows.
Note: Most Rab hats come in one size, designed to comfortably fit a head circumference of 55–60 cm. If your head is smaller or larger than this range, try one on in store to confirm the fit.
Hat & Cap Sizing
Size Head Circumference (cm)
One Size 55–60
S/M 55–57
L/XL 58–60

How to Measure — Hats

1
Wrap the TapeWrap a soft tape measure around the thickest part of your head — usually around the forehead, just above the eyebrows and ears.
2
Keep it LevelMake sure the tape is level all the way around your head. Don't pull it tight — keep it snug but comfortable.
3
Find Your SizeNote the measurement in cm and match it to the chart above. Most Rab beanies and hats are one size and fit 55–60 cm comfortably.

Size guide sourced from Rab. For any queries, visit greatoutdoors.ie or contact our team in store.
Sold out
Get it Fri, Jun 5 – Mon, Jun 8
Free Delivery over €75 (IE) 31-Day Returns Policy
Benefits
pertex quantum fabric
rds‑certified down
down fill
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Details

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strong>Brand Rab
Product Ascent Down Sleeping Bag (-18°C)
Product Code QSN-05
Shape Wide Mummy
Weight 1650 g / 3 lb 10.2 oz
Packed Size 26 cm x 45 cm (10.2 in x 17.7 in)
Insulation 650FP European duck down with fluorocarbon-free hydrophobic finish
Main Fabric 20D Pertex® Quantum nylon ripstop (38 g/m²) with fluorocarbon-free DWR
Lining Recycled 20D nylon (38 g/m²)
Temperature Rating (ISO 23537-2:2022) Comfort: -10°C (14°F); Limit: -18°C (0°F); Extreme: -40°C (-40°F)
Limit of Comfort -18°C / 0°F
Manufacturing Hand-filled in Derbyshire, UK; Manufactured in China
PFAS No

We offer free delivery on all orders over €75, and €5.95 for all orders under €75.
 -We aim to ship all orders placed before 1:00pm on the same business day and have it delivered next-day, but in busy periods this can take longer, so allow for up to 3 working days for fulfillment.

We accept returns within 31 days of receiving the item, either in-store or by post. 
- All items returned must be suitable to be sold again as new. For our full returns policy - click here.
- In-store returns are Free of charge, and returns posted with An Post via our returns page are €5 from a post office, or €6 collected from your home.
- All returns can be organised with An Post click & post, and will be fulfilled as soon as they arrive back at our store. Click here to start a return.

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