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 82 reviews
N. B.
Product Size: XXL
Height: 5'10
Weight: 250
Waist Size: 38
Inseam Length: 32
Draw Length: 29
Location: IL
Primary Use: on skin base layer
The perfect layer

Perfect for colder late mid season to late season sits requiring a comfortable and warm layer against the skin.

Peyton Raburn
Product Size: XL
Height: 6’
Weight: 280
Waist Size: 40
Inseam Length: 32
Draw Length: 29.5
Location: Tennessee
Primary Use: Whitetail and hogs
Extremely short crotch box

These are way too small in the crotch. The long underwear from FL has a ridiculous amount of room while these cut my balls in half and suffocate everything else. The legs are too long for me as well. I’m 6ft and I’ve got material bunched up at my ankles. The crotch box is so short I can’t pull these up far enough to sit with my underwear

Brent Dickson
Product Size: M
Height: 5' 9"
Weight: 160
Waist Size: 32
Inseam Length: 32
Location: GA
Primary Use: Turkey, whitetail, and hog
Southeastern Necesity

I just started this year, 2021, looking in to camo for myself and my pro-staff and settled on First Lite being the way to go. In the Southeastern US, I recommend these highly as they will make you only need 2 layers. Keeps you lightweight, warm, and comfortable. Here in GA all you need are these long John's and a pair of obsidian merino pants as a bottom layer system. The long John's are amazingly warm, soft, and comfortable. They aren't so tight you feel crammed and they are breathable. Highly recommend the use of these.

Bradly May
Product Size: L
Height: 5'7"
Weight: 185
Waist Size: 34
Inseam Length: 30
Location: Ontario Canada
Primary Use: Deer hunting

One of the nicest base layers I have ever owned! The only thing is I am a short guy with a bigger waist so the legs are a little long

Bruce McKechnie
Product Size: 36 x 32
Height: 5’10
Weight: 195
Waist Size: 36
Inseam Length: 31
Draw Length: 28”
Location: Elk hunting here in the Montana mountains and breaks.
Primary Use: Bow hunting, rifle season, pheasant hunting, wolf and coyote calling, and hiking
Perfect in all Regards!

It’s 100 degrees plus out right now so haven’t had a chance to get these out in the timber yet but it’s obvious when the temps drop here in Mt. (cmon Sept!)these will be perfect performers. Thank you Firstlite and all the staff! Dylan, Fran, and James, you guys were awesome!

Tanner Shuler
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!

Jacob Zutterman
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.

Jeffrey Fisher
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.

James Labelle-Brennan
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!

Dean Mihaly
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.