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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


In Stock & Ready to Ship

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

Customer Reviews

Based on 290 reviews
Kyle Pietras
Product Size: M

Men's Furnace Long John

dennis m.
Product Size: 36 x 32
Height: 6 foot
Weight: 205
Waist Size: 36
Inseam Length: 32
Draw Length: 291/2
Location: Hunting

Very pleased with the first lite furnace long Johns I purchased. They were great in the tree stand on late season hunts.

Cassandra Jackson
Product Size: M
Height: 5'6
Weight: 170
Waist Size: 35
Inseam Length: 30
Best Cold Weather Base Layer!

I have tried a lot of cold weather base layers and this one tops them all for warmth and fit! Excellent product for those cold, snowy hunts!

John K
Product Size: XXL
Height: 5’ 11”
Weight: 300 lbs. maybe
Waist Size: 42” -44”
Inseam Length: 30” -32”
Location: New Brunswick Canada
Primary Use: All outdoor activities in the winter.
Excellent weight for warm longjohns

I was super excited to get my furnace longjohns in the mail. I love my kiln long johns and thought the warmer pair would be excellent. The furnace fabric seemed thick and warm, just what I was looking for. I did have to return them though. The fit of the furnace was way smaller than the kiln, and they wouldn’t fit me. That said, the customer service experience returning the long johns was outstanding, and only strengthened my opinion of First Lite as a company. I’d say order one size, or even two sizes, larger than the kiln when buying furnace. They did seem awesome!

William Freese
Product Size: M
Height: 5’4”
Weight: 185
Waist Size: 34
Inseam Length: 30
Draw Length: 27
Location: Bow hunting
Primary Use: Under layer
Super warm

Wicks the moisture from the walk in and is super cozy

Product Size: M
Height: 5 5
Weight: 200
Waist Size: 36
Inseam Length: 32
Primary Use: waterfowl
furnace long john

Perfect inner layer to go under my breathable waders for late season waterfowl hunts.

Brandon Sullivan
Product Size: L
Height: 5’10”
Weight: 165
Waist Size: 33
Inseam Length: 32
Draw Length: 28.5
Location: Late season bow hunting in the Midwest.
Primary Use: Bow hunting
Furnace warmth

Great piece of gear! Sizing is perfect!

Scott Endres
Product Size: L
Height: 6’1
Weight: 200
Waist Size: 34
Inseam Length: 34

Still waiting for smaller size that you received back on Dec. 30,2021

Steven Jones
Product Size: L
Height: 5’9”
Weight: 220
Waist Size: 36-38
Inseam Length: 32
Location: NY
Primary Use: Hunting white tail
Base Layer

First season using first lite products. So glad I ordered their hunting products. Made well and fits perfect. I’m usually XL in everything but after talking to representatives from first lite, I ordered Large in base layers and they fit perfect. Not loose and not tight. Form fittinf to the body. Absolutely love it.

Debra Frack
Product Size: XL
Height: 6’2
Weight: 215
Waist Size: 36
Inseam Length: 32
Location: Out side in the snow
Primary Use: Snow shovel g etc.

My husband is very pleased with this product!