Men's Furnace Long John | First Lite
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Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John
Men's Furnace Long John

Men's Furnace Long John

EXP 350 Merino-X

$110.00 USD


Whether you pulled a late-season elk hunt or are down to the closing bell in the treestand, First Lite's Furnace Long John is the perfect tool to help you punch that tag in cold weather. Using our Merino-X 350g EXP weight fabric, the Furnace Long John provides lofted insulation and protection from the coldest temperatures. Featuring flatlock seams, a brushed, jacquard waistband and an articulated fit, the Furnace Long John leverages the loft, structure and stretch of our Merino-X fabric to provide the ideal layering piece over our other lightweight, next-to-skin styles.This system is the new standard for stationary hunts or late season stalks when staying warm is critical to success.

Our Furnace EXP 350 Merino-X fabric incorporates a brushed (or fleeced) backside to our high loft, interlock knits to provide super-charged insulation without added weight. Adding this to the silent, odor-free benefits of merino wool, the Furnace merino is the hands-down choice for cold weather hunts.

The Furnace EXP 350 is also available in Henley and Quarter Zip Tops.

Product Videos

Men's Furnace Long John Details

Layering Position

  • Midlayer


  • True to size: Purchase your normal size to wear over or under other layers
  • 20.5 micron, superfine merino wool
  • 95% merino / 5% spandex
  • Expedition weight, fleeced Merino fabric for extreme cold
  • Full length
  • Jacquard waistband
  • Fully functional fly
  • Flatlock seams

How It's Built

  • Material: Merino-X
  • Cut: Athletic
  • Primary Uses:
    • Tree Stand
    • Waterfowl
    • Upland
    • Fishing
  • Material Weight: 350 Heavyweight
  • Weight: 12oz.

Where to Use

  • Regions:
    • Intermountain/Rockies
    • Midwest
    • Northeast
    • BC/Alaska
    • Pacific Northwest
    • Southeast
  • Temperature Ranges:
    • Below 20F
    • 20F - 45F
    • 45F - 60F

Customer Reviews

Based on 77 reviews
Product Size: M
Height: 5' 7"
Weight: 160
Waist Size: 32
Inseam Length: 31
Location: WY
Primary Use: Hunting/Hiking
Perfect Cold Weather Base

I use these for temps below 40, or as a base inside a sleeping bag for cold nights!

Product Size: L
Height: 6’0”
Weight: 220
Waist Size: 34
Inseam Length: 34
Location: Kansas
Primary Use: Cold sits or cool stalks
Warm and Comfortable

Just what you’d expect out of merino wool: warm and breathable. No pulling at hair, no sweating when the temps start rising or you start walking. A comfortable base layer you don’t feel the need to change when it walking in cool temps. It’s my go to under my pants for mid to late season whitetails and cool mornings for spring gobblers.

Product Size: L
Height: 6'1''
Weight: 185
Waist Size: 32
Inseam Length: 34
Solid base layer

Sometimes it's hard to know what type of product you're getting by viewing solely through the internet. I want to ensure you that the quality of this material is legit. The material is very dense, thick, and comfortable. The material reminds me of the cuff from the Sanctuary coat that First Lite offers. I would highly suggest that you purchase.

Product Size: M
Height: 177
Weight: 155
Waist Size: 33
Inseam Length: 33

True to size, super warm, really comfy, very nice stretch yet no tight!

Product Size: XL
Height: 6'
Weight: 220lb
Waist Size: 34/36
Inseam Length: 32
Location: New Hampshire
Primary Use: Ice fishing, cold weather hiking, winter outdoors work
Awesome product

I received these as a Christmas gift, and I have recommended them to all of buddies since. I wasn't able to use them for hunting purposes yet with the way our seasons fall, but this winter I was able to wear them ice fishing and hiking on several occasions (all in temps ranging from single digits to below freezing) and I can't enough good things about them. They certainly keep me warm and dry when active and working up a sweat, and stayed that way once I stopped moving, and traditionally would find myself damp and cold. I've thrown them on to hop on my tractor and plow our driveway, and just sitting exposed to the elements, they performed beyond my expectations. Awesome product that can increase warmth and comfort for a wide range of layering and activities.

Product Size: M
Height: 6'3"
Weight: 200
Waist Size: 34"
Inseam Length: 36"
Location: Flight Line, Airport, Grassland
Primary Use: Hunting, Vehicle Maintenance
Roasty Toasty

Used this during the most recent cold spell, the power went out and it was -10F outside and inside it hit zero. These undergarments performed exemplary keeping my legs nice and warm even when going outside. Even now I'm wearing it at 70F, Its very comfortable and not too warm.

Product Size: M
Height: 5' 9''
Weight: 160
Waist Size: 32
Inseam Length: 31.5
Draw Length: 27
Location: Alaska
Primary Use: Still Hunting, Active Hunting
Best Heavyweight Merino Long John

This piece is sized very true to size and makes for the perfect heavyweight baselayer under any pant for winter use. I've gone dozens of miles in a day during the dead of winter with just this piece under my softshell pants and stayed plenty warm. The brushed inner of this piece feels very comfortable and the face layer of this piece resists wear pretty good against the seams of any hunting pant.

I recommend ordering your normal size.

This is a very warm layering piece.

Five star rating.

Product Size: XXL
Height: 6'1"
Weight: 270
Waist Size: 40
Inseam Length: 32
Late season bird hunt

Went upland bird hunting in low teens, sub zero wind chill weather. These and the obsidian merino pants kept me not warm, but tolerable given the 40 mph wind gusts. Ended up boys deep in a snow drift and then mid calf deep in a creek and and still stayed tolerable. Defiantly lived up to their well deserved reputation.

My only critque is they're a little tight in the crotch and long in the leg.

Product Size: M
Height: 69”
Weight: 190
Waist Size: 32
Inseam Length: 30
Draw Length: 29
Location: Ohio
Primary Use: Deer Stand sitting

These long Johns are perfect for cold weather tree stand sits in Ohio. Matched with a pair of merino pants and my legs were comfortable the duration of the hunt. Highly recommended for all outdoor activities in the cold weather.

Product Size: L
Height: 5 10
Weight: 200
Waist Size: 36
Inseam Length: 31
So great

Absolutely perfect for late season sits in Minnesota and ice fishing all season great quality