Isleif Ultralight Hardshell Jacket
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Isleif Ultralight Hardshell Jacket
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Isleif Ultralight Hardshell Jacket

£359.00

Highly breathable, windproof, ultralight waterproof shell for fast-moving activity in changeable weather.  

Only 250g of hardshell defence at a windshell weight. Built on Pertex® Shield 3-layer ripstop fabric with NetPlus® — 100% recycled fishing nets recovered from the ocean.  20,000mm waterproofing, mechanical stretch and fully taped seams. Packs into its own pocket. 

Storm hood with mouldable peak, AquaGuard® zips and a close athletic cut. Everything else — including why NetPlus® matters — is below.
Colour Black
Size Small

Sizing charts

The measurements in the charts refer to your body measurements. Measure your body as described and then choose the corresponding product size.

Men's Sizing

Small
EUR 46 - 50 		Medium
EUR 50 - 52 		Large
EUR 52 - 54 		X Large
EUR 54 - 56
Chest 96 - 102 cm
38 - 40 in.		 102 - 106 cm
40 - 42 in.		 106 - 111 cm
42 - 44 in.		 111 - 116 cm
44 - 46 in.
Waist 76 - 81 cm
30 - 32 in.		 81 - 86 cm
32 - 34 in.		 86 - 91 cm
34 - 36 in.		 91 - 96 cm
36 - 38 in.
Inside Leg 80 cm
31.5 in.		 81 cm
31.9 in.		 82 cm
32.2 in.		 83 cm
32.7 in.



Women's Sizing

X Small
UK 6 - 8
EUR 34 - 36
US 2 - 4 		Small
UK 10 - 12
EUR 36 - 38
US 6 - 8 		Medium
UK 12 - 14
EUR 40 - 42
US 8 - 10 		Large
UK 14 - 16
EUR 42 - 44
US 10 - 12
Bust 82 - 86.5 cm
32 - 34 in.		 86.5 - 91.5 cm
34 - 36 in.		 91.5 - 96.5 cm
36 - 38 in.		 96.5 - 101.5 cm
38 - 40 in.
Waist 64 - 68.5 cm
25 - 27 in.		 68.5 - 73 cm
27 - 29 in.		 73 - 77.5 cm
29 - 31 in.		 77.5 - 82.5 cm
31 - 33 in.
Low Hip 88 - 92.5 cm
34.5 - 36.5 in.		 92.5 - 97.5 cm
36.5 - 38.5 in.		 97.5 - 102.5 cm
38.5 - 40.5 in.		 102.5 - 107.5 cm
40.5 - 42.5 in.
Inside Leg 77 cm
30.3 in.		 78 cm
30.7 in.		 79 cm
31.1 in.		 80 cm
31.5 in.


How to measure

 

Measuring guide

Chest/Bust

With the tape under your armpit, measure across fullest part and across shoulder blades.

Waist

Measure around natural waistline at the narrowest part.

Low Hip

Measure around the widest part of the hip bones.

Inside leg

In a standing position, measure from top of inside leg at crotch to ankle bone.
Delivery £3.99. Next Day £9.99
Use & Highlights

When to use — Trail running, fell running, fast alpine approaches and trekking in changeable weather. The lightest waterproof shell in the Jöttnar range — for when weight on the move is the primary consideration. At 250g it stuffs into its own hand pocket and disappears into a vest or running pack. Close, athletic cut keeps bulk minimal.

Pertex® Shield Pro with NetPlus® — why the fabric source matters.The face fabric is made from 100% recycled fishing nets recovered from the ocean via the Bureo® NetPlus® programme. This is a more demanding and traceable standard than standard recycled nylon — the nets are recovered from fishing communities and fully certified to source. The 30D construction keeps weight minimal without sacrificing the 20,000mm waterproofing. Fully taped seams throughout means no weak points for water ingress.

Stretch — Mechanical 2-way stretch moves with the body, a meaningful distinction from stiffer woven shells.

Packability — Stuffs into its own hand pocket. At 250g it genuinely doesn’t register in a running vest or pack.

Hood & closures — Storm hood with mouldable peak. Pre-elasticated cuffs and low-profile hem adjusters. AquaGuard® waterproof zips throughout.

Visibility — Reflective chest and rear logos improve visibility in low light — for pre-dawn or post-dusk running.

Ethics & sustainability — 100% recycled NetPlus® nylon face, fully traceable to source. PFC-free DWR finish.
Tech Specs & Care

Outer fabric
Pertex® Shield 84gsm
30D 3-layer construction with mechanical 2-way stretch
100% recycled NetPlus® nylon face (recovered ocean fishing nets)
7D nylon tricot backer
PFC-free DWR finish
Fully taped seams
20,000mm hydrostatic head minimum

Hood
Close fitting hood with mouldable peak
Pre-elasticated cuffs

Closures
YKK® AquaGuard® waterproof zips throughout
Low-profile hem adjusters

Pockets
1 × hand pocket (doubles as stuff sack)

Safety
Reflective chest and rear logos for low-light visibility

Weight & fit
250g (men’s medium)
Close, athletic cut with articulated sleeves and scoop-drop hem

Care
Machine wash 30°C — gentle wash
Line dry / hang to dry
Do not tumble dry, do not iron, do not dry clean, do not bleach

Materials. Pertex® Shield 84gsm — 30D 3-layer construction with mechanical 2-way stretch, 100% recycled NetPlus® nylon face, 7D nylon tricot backer, PFC-free DWR finish

Care Instructions. Machine wash 30°C — gentle wash, line dry / hang to dry, do not tumble dry, do not iron, do not dry clean, do not bleach

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