Mountain Equipment Senja Men's Jacket

The Senja Men's Jacket is a versatile, packable down jacket built for cold-weather adventures. Filled with 220 g of 700 fill power duck down and wrapped in Mountain Equipment's Drilite Loft outer fabric, it sits comfortably in the mid-range of the ME insulation lineup, warmer than the Frostline and Earthrise, lighter than the Lightline. Whether you're heading into the hills for a day hike, setting up a belay on a winter climb, or travelling through cold climates, the Senja is a reliable companion that packs down small when you don't need it.

The stitch-through baffle construction keeps the down evenly distributed across the jacket, preventing cold spots and maintaining consistent warmth. The Mountain HC Insulated Hood offers solid coverage in exposed conditions and is compatible with a helmet, while dual tether hem drawcords and adjustable elasticated cuffs help seal in heat when the temperature drops.

Features

Insulation

• 220 g (size L) of 90/10 duck down with a minimum 700 fill power
• Baffle-by-baffle insulation placement maximises warmth relative to down weight
• Down sourced in accordance with DOWN CODEX and RDS standards
• Unique DOWN CODEX code included for full traceability of down source and fill power

Materials

• Drilite Loft 40D outer shell with microporous PU coating and PFAS-free DWR; Hydrostatic Head 1,500 mm
• 20D recycled polyamide downproof lining

Patterning and Design

• Stitch-through baffle construction throughout
• 8 cm baffle height
• Cut to accommodate base and mid-layers comfortably

Hood Configuration

• Mountain HC Insulated Hood with HALO baffle and integrated collar
• Helmet compatible
• Internal hood cord routing with internal Duraflex cord locks
• Rear tab volume adjuster

Pocket Configuration

• Two zipped hand warmer pockets with Drilite Loft anti-snag draft backer and insulated zip plackets
• Internal zipped security pocket

Centre Front Zip

• YKK #5 VISLON two-way centre front zip with non-locking slider
• Internal centre front zip baffle with fastener

Cuffs and Sleeves

• Pre-shaped sleeves for full range of motion
• Elasticated cuffs with Velcro fastener

Waist and Hem

• Dual tether hem drawcords
• Two adjustable drawcord pullers

Further Features

• Includes lightweight stuff sack
• Shell fabric manufactured in Taiwan
• Designed and developed in the UK; manufactured in China

Specifications

Technology

	Down 700 Our 700 fill power duck down is in the sweet spot of price and performance, offering excellent quality for all but the most serious use. Being down, it has a superb warmth-to-weight ratio, compressibility, lifespan, and softness.
	DOWN CODEX Our DOWN CODEX programme has set the benchmark for down sourcing in the outdoor industry since 2009. All our down is RDS (Responsible Down Standard) certified and using a unique barcode in each product you can track the exact quality of the down that you buy.
	Drilite Loft Drilite Loft is an exclusive range of highly water-repellent fabrics used in Mountain Equipment's insulated clothing and equipment. The original Drilite Loft, introduced almost 30 years ago, was years ahead of its time: a highly breathable, lightweight, and very water-repellent fabric. Those three hallmarks continue with our modern Drilite Loft fabrics.
	Fair Wear Mountain Equipment is a member of the Fair Wear Foundation, an independent, non-profit organisation that works with brands and factories to improve working conditions for garment workers.