Mountain Equipment Lightline Men's Jacket

This iconic and consistently top-selling technical duvet jacket remains an essential companion for extreme cold, wherever in the world one may venture.

Crafted to meet the rigorous needs of contemporary mountaineers, the Lightline Jacket continues to set the standard for lightweight, high-performance duvets. With its hooded construction and water-resistant outer, it delivers exceptional warmth and protection in sub-zero climates.

It features 700-fill power Pure Down, secured in place by stitched-through baffles to maximise thermal efficiency and prevent the down from shifting—particularly around critical areas like the shoulders, chest and hood. Every batch of down is responsibly sourced, minimally treated, and certified by the DOWN CODEX® system, ensuring complete transparency and ethical integrity throughout the supply chain.

The outer shell, constructed from lightweight and highly water-resistant Drilite Loft fabric, enables the down to fully loft for maximum insulation while shielding against melting snow and swirling spindrift. Drilite Loft offers complete windproofing and superior breathability, keeping the wearer warm and dry in even the harshest environments.

Tailored with a regular Mountain fit, the jacket is designed to layer effectively without adding bulk or restricting movement, offering freedom of motion whether carrying a pack, using ice tools, or managing ropes. An adjustable hem drawcord and cuff fastenings help to block out the cold and fine-tune the overall fit.

A fully insulated, detachable hood with a wired peak provides critical protection in extreme weather. The hood’s three-panel construction ensures a close fit around the head, while adjustable drawcords—easy to use even with gloves—allow for a personalised fit. When needed, the hood can be removed to reduce weight and bulk.

A robust two-way YKK moulded centre zip resists freezing and is backed by an internal baffle to retain warmth. Inside the jacket, a zipped security pocket keeps valuables safe, while the two hand-warmer pockets serve both as convenient storage and a refuge for cold fingers.

Lightweight, insulating and built for protection, the Lightline Jacket continues to stand as a benchmark in cold-weather performance.

Features

Insulation

• The jacket is filled with 296g (size large) of Duck Down containing at least 90/10 ratio and 700 fill power, offering outstanding warmth without excessive weight or bulk.
• Insulation is strategically distributed using a baffle-by-baffle construction to deliver optimal warmth for the weight.
• The down is sourced in compliance with the DOWN CODEX® and RDS 3.0 standards, ensuring high welfare practices.
• Each product carries a unique DOWN CODEX® code, allowing traceability of the down's origin, precise fill content, and quality data.
  
  

Materials

• The DRILITE® LOFT outer shell, coated with PU and made from 40 Denier fabric, is lightweight, durable and highly weather-resistant, boasting a 1500mm Hydrostatic Head.
• The 20 Denier downproof inner lining provides excellent moisture transfer, comfort, and compressibility.
  
  

Patterning & Design

• Stitched-through baffle construction ensures excellent warmth while maintaining mobility and a compact pack size.
• The jacket is intended to be worn comfortably over both base and mid-layers.
  
  

Hood Configuration

• The Mountain Insulated Hood is zip-off, designed for superior comfort and protection, and can be removed to reveal a high protective collar when conditions allow.
  
  

Pocket Configuration

• Two zipped hand-warmer pockets provide warmth and accessible storage.
• One internal zipped security pocket ensures safe storage for valuables.
  
  

Centre Front Zip

• The two-way YKK® moulded front zip is glove-friendly and designed to withstand icy build-up.
  
  

Cuffs & Sleeves Configuration

• The cuffs are both adjustable and elasticated, ensuring a snug fit and compatibility with gloves.
• Sleeves are cut to offer unimpeded freedom of movement.
  
  

Waist & Hem Construction

• Dual-tether drawcords at the hem allow for tailored adjustment and enhanced thermal retention.
  
  

Further Features

• The jacket comes with a lightweight stuff sack for easy packing.
  It is built for durability and is backed by a Product Lifetime Guarantee.
• Designed and developed in the United Kingdom and manufactured in China.
  

Specifications