Ascent Down Sleeping Bag -18°C/0°F
Ascent Down Sleeping Bag -18°C/0°F

Ascent Down Sleeping Bag -18°C/0°F

When comfort and uninterrupted rest are your highest priority, this warm, robust sleeping bag offers dependable refuge...
Availability: In stock
$157.50
$524.99
$157.50
Subtotal: $157.50
Size guide
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Description
When comfort and uninterrupted rest are your highest priority, this warm, robust sleeping bag offers dependable refuge for trekking and backpacking.

Looking for a sleeping bag that prioritises warmth, comfort, and practicality? That will give you an easy night’s rest in the wild, without compromising on weight or pack size? This robust, reliable down-filled bag offers the versatility you need for regular mountain use. Armed with 650FP duck down, a spacious wide mummy shape, windproof Pertex® Quantum fabric, and a clever baffle construction that maximises warmth for weight, it's perfect for trekking and backpacking adventures. Hand-filled in the UK, all our down bags benefit from never having had their down compressed before use, preserving its loft and warmth.

Features
• Activities: Camping, Trekking
• L.O.F.T™ construction uses alternating wide and narrow baffles to achieve great warmth for weight
• Sleep comfortably on your side thanks to the sidewall baffles, which reduce cold spots and ensure you’re not lying on a seam
• A second shorter zip with integrated snap closure allows you to use your arms while retaining heat in your sleeping bag, ideal for cooking in the cold
• Cinch in the hood to seal in the heat, while the synthetic insulated collar sits snugly around your neck
• Sleep in a relaxed, comfortable position thanks to the roomy, anatomically shaped foot box
• Keep valuables and essentials close at hand with a zipped internal stash pocket
• Wide mummy fit gives space for extra layers when night temperatures plummet
• Internal cordlocks positioned below your collar bone for greater side sleeping comfort
• Two-way Ykk® ¾ length main zip with synthetic-filled baffle
• Ykk® anti-snag zip insert and anti-snag internal zip guard
• Drawcord stuff sack included
• Zipped storage sack with water-resistant base for home storage
• Hand-filled in Derbyshire UK
• Fluorocarbon(PFAS)free fabric
• Fluorocarbon(PFAS)free product
• Made with renewable energy

Materials
• Main: 20D Pertex® Quantum Nylon Ripstop(38g/m²)with fluorocarbon-free DWR
• Insulation: 650FP European duck down with Grangers fluorocarbon-free hydrophobic finish
• Lining: Recycled 20D Nylon, 38g/m²

Specifications
• ISO(23537-2:2022)temperature rating: Comfort: -10°C(14°F), Limit of comfort: -18°C(0°F), Extreme: -40°C(-40°F)
Performance
• Lightness: 3/5
• Pack size: 1/5
• Environment use: 4/5
Ascent Down Sleeping Bag -18°C/0°F

Ascent Down Sleeping Bag -18°C/0°F

$524.99 $157.50
Ascent Down Sleeping Bag -18°C/0°F

Ascent Down Sleeping Bag -18°C/0°F

$524.99 $157.50
Size chart
Altitude Sports Outlet — Size Guide

Size Guide

All measurements in inches (in) and pounds (lb). Built for the trail, fitted for you.

Men's Tops & Jackets

Chest: measure around the fullest part. Sleeve: from center back neck to wrist.

Size Chest (in) Waist (in) Sleeve (in)
S 36–38 29–31 32–33
M 39–41 32–34 33–34
L 42–44 35–37 34–35
XL 45–48 38–41 35–36
XXL 49–52 42–45 36–37
Women's Tops & Jackets

Bust: measure around the fullest part. Sleeve: from shoulder seam to wrist.

Size Bust (in) Waist (in) Sleeve (in)
XS 31–32 24–25 30–31
S 33–35 26–27 31–32
M 36–37 28–30 32–33
L 38–40 31–33 33–34
XL 41–43 34–36 34–35
Men's Bottoms (Hiking Pants / Shorts)

Waist: measure around natural waistline. Inseam: from crotch to ankle.

Size Waist (in) Hip (in) Inseam (in)
28 28–29 35–36 30–32
30 30–31 37–38 30–32
32 32–33 39–40 31–33
34 34–35 41–42 31–33
36 36–37 43–44 32–34
38 38–39 45–46 32–34
Women's Bottoms (Hiking Pants / Leggings)

Waist: measure around natural waist. Inseam: from crotch to desired length.

Size Waist (in) Hip (in) Inseam (in)
XS (0–2) 24–25 34–35 29–30
S (4–6) 26–27 36–37 29–30
M (8–10) 28–30 38–40 30–31
L (12–14) 31–33 41–43 30–31
XL (16) 34–36 44–46 31–32
Men's & Women's Shoes (Running / Hiking / Trail)

Foot length: measure heel to longest toe. For hiking boots, size up ½ size.

US Men US Women Foot Length (in) EU
7 8.5 9.6–9.8 40
8 9.5 10.0–10.2 41
9 10.5 10.4–10.6 42
10 11.5 10.8–11.0 43
11 12.5 11.2–11.4 44
12 13.5 11.6–11.8 45
13 — 12.0–12.2 46
Kids' Shoes (Running / Hiking)

Foot length: measure heel to longest toe. Kids grow fast—size up for growing room.

US Kids Foot Length (in) EU
10 6.5–6.7 27
11 6.8–7.0 28
12 7.1–7.3 29
13 7.4–7.6 31
1 7.7–7.9 32
2 8.0–8.2 33
3 8.3–8.5 34
4 8.6–8.8 35
5 8.9–9.1 36
6 9.2–9.4 37
Backpacks (Daypack / Hiking / Camping)

Torso length: measure from C7 vertebra (base of neck) to top of hip bones.

Size Torso Length (in) Capacity (L) Best For
XS / S 15–17 20–35 Day hikes / kids
M 17–19 35–55 Weekend trips
L / XL 19–21 55–75 Multi-day / thru-hikes
Sleeping Bags

User height: measured flat on back. Temperature ratings are guidelines—layer up in cold.

Size User Height (in) Shoulder Girth (in) Temp Rating (°F)
Regular up to 72 60–62 20°F / -6°C
Long up to 78 62–64 20°F / -6°C
Double up to 72 (each) — 30°F / -1°C
Tents (Camping / Backpacking)

Capacity is based on average adult sleepers. Size up for extra gear or pets.

Capacity Floor Area (sq ft) Peak Height (in) Best For
1-Person 15–20 36–40 Solo backpacking
2-Person 25–32 40–44 Couples / duo trips
3-Person 35–45 44–48 Small family
4-Person 50–65 48–56 Family / basecamp
6-Person 75–95 56–68 Group / car camping
Cycling Helmets

Head circumference: measure around forehead, just above eyebrows.

Size Head Circumference (in) Head Circumference (cm)
XS/S 20.0–21.5 51–55
M 21.5–23.0 55–59
L/XL 23.0–24.5 59–63
How to measure. Use a soft tape measure over light clothing. For the most accurate fit, measure twice and compare to the table above.
Between sizes? For tops and jackets, size up if you plan to layer. For hiking boots and trail shoes, size up ½ size to accommodate thicker socks.
Still unsure? Our gear is backed by a 60-day free return policy—find your fit risk-free. Contact support@altitude-sportshub.it.com and we'll help you nail it.

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