How does the D-8 T Pertex Techno Down Jacket fit, and should I size up for layering?

The jacket offers an ergonomic fit designed for freedom of movement. If you plan to layer thicker pieces underneath, consider sizing up for added comfort.

Is the D-8 T jacket suitable for both skiing and everyday use?

Yes, this jacket is engineered for high alpine activities like skiing and mountaineering but also works well for city wear and daily use in cold weather.

What is the best way to care for and wash this down jacket?

Wash at 30°C with mild detergent, avoid fabric softener, and tumble dry on low heat with tennis balls to help restore loft. Always close fasteners and wash inside out.

Can this jacket handle wet and windy conditions?

The 20D Pertex Quantum fabric is tightly woven for wind resistance and offers balanced breathability. While it provides protection against light moisture, it is best paired with a shell for heavy rain.

Is the D-8 T jacket packable for travel and outdoor activities?

Yes, the lightweight construction and compressible down filling make it easy to pack for travel, skiing, or trekking.

Can this down jacket replace a shell or insulated ski jacket in mild winter weather?

In mild, dry winter conditions, the D-8 T jacket can be worn as a standalone outer layer. For harsher weather, it is best used as an insulated midlayer under a shell.

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Model wearing The Mountain Studio D-8 T down jacket in beige with diamond quilting, zippered chest pockets, and minimalist branding, paired with black technical pants, hiking shoes, and an olive beanie. image

Side view of a person wearing The Mountain Studio D-8 T down jacket in beige with diamond quilting, paired with black pants, orange hiking shoes, and an olive beanie. image

Back view of a person wearing The Mountain Studio D-8 T down jacket in beige with diamond quilting, paired with black pants, hiking shoes, and an olive beanie. image

D-8 T

4,100.00 kr

Pertex Techno Down Jacket
Castle Wall

Size

XS

S

M

L

XL

XXL

Use our size guide

The D-8 T Pertex Techno Down Jacket from The Mountain Studio is engineered for high alpine conditions and demanding winter environments. Constructed with 20D Pertex Quantum fabric, this jacket balances protection and breathability for reliable performance in cold weather. The diamond quilt design is filled with 800 fill power RDS-certified down, delivering strong insulation and a lightweight feel for mountain pursuits or city use.

This technical down jacket features uniquely engineered rhomboid filaments in the shell, increasing durability and longevity. The jacket is designed for versatility, working as a standalone piece or as a warm midlayer under a shell for harsh conditions. Two zippered chest pockets provide secure storage, while the ergonomic fit supports freedom of movement during skiing, hiking, or everyday activities.

Available in beige, black, and green, each colorway offers a refined look with minimalist branding and clean lines. The Pertex Quantum fabric resists abrasion and maintains loft, ensuring consistent warmth and comfort. The jacket is easy to care for and retains its shape through repeated use.

The Mountain Studio prioritizes responsible material choices, using RDS-certified down and durable technical fabrics. The D-8 T jacket is built for long-term use, supporting a wide range of outdoor activities and urban scenarios. This is high quality outerwear designed for lasting warmth, reliability, and mountain-ready performance.

What’s my size?

We feel that the best method to determine your size is to measure a similar favorite garment you already own – i.e. an insulated ski jacket if you are buying an insulated ski jacket etc. Compare with the chart below which is unique for each product. Please bear in mind that our shell garments are made to be quite loose fitting, to be able to add one or more layers beneath.

Flip horizontal to view full size chart on mobile.

How to measure

1/2 CHEST: Measure straight 1 cm below armhole from side to side
1/2 BOTTOM HEM WIDTH: Measure straight at bottom hem from side to side
SLEEVE LENGTH: Measure from shoulder point (at top of armhole) to sleeve
CENTER BACK LENGTH: Measure at the back side straight from center neckline to bottom hem in the center

Size	XS	S	M	L	XL	XXL
1/2 CHEST	55 cm	57 cm	60 cm	63 cm	66 cm	69 cm
1/2 BOTTOM HEM WIDTH (relaxed)	51 cm	53 cm	56 cm	59 cm	62 cm	65 cm
SLEEVE LENGTH	70 cm	71 cm	72 cm	73 cm	75 cm	77 cm
CENTER BACK LENGTH	70 cm	71 cm	72 cm	73 cm	75 cm	77 cm

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Pertex Techno Down Jacket
Castle Wall

Engineered in Switzerland

Pertex Techno Down JacketCastle Wall

D-8 T (Castle Wall)

D-8 T (Forest Green)

D-8 T (Black Onyx)

Description

Features & materials

Care

Shipping & Returns

How does the D-8 T Pertex Techno Down Jacket fit, and should I size up for layering?

Is the D-8 T jacket suitable for both skiing and everyday use?

What is the best way to care for and wash this down jacket?

Can this jacket handle wet and windy conditions?

Is the D-8 T jacket packable for travel and outdoor activities?

Can this down jacket replace a shell or insulated ski jacket in mild winter weather?

Engineered in Switzerland

Pertex Techno Down Jacket
Castle Wall