Men's Fuse Long John – First Lite Performance Hunting
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Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John
Men's Fuse Long John

Men's Fuse Long John

Lightweight 200 Aerowool

$90.00 USD

Color/PatternFirst Lite Cipher

When temperatures begin to fall but breathability and dry times are still concerns, the Men's Fuse Long John is your go-to base layer. Featuring a comfortable, jacquard waistband and a fully articulated fit designed to leverage the structure and stretch of our Aerowool fabric, the Fuse Long John epitomizes versatility in the field.

Lightweight 200 Aerowool construction combines the finest, 17.5 micron merino wool available with 37.5-activated nylon fibers to create a super-charged fabric with incredible performance benefits. What you get is enhanced odor resistance, exponentially improved dry times, increased durability and moisture wicking, and a fabric that can cool you down when you're heating up and warm you up when it's cooling down.

The Fuse Lightweight 200 Aerowool is also available in a men's a men's crew, quarter zip and a Henley

Product Videos

Men's Fuse Long John Details

Layering Position

  • Next to Skin


  • True to size: Purchase your normal size to wear over or under other layers
  • 17.5 micron, ultrafine, merino wool
  • Lightweight 200gsm jersey knit fabric provides exceptional versatility
  • Exclusive 37.5 Active Particle Technology to exhaust moisture and maintain optimal core body temperature
  • Full length
  • Next-to-skin fit for maximum comfort and support
  • Jacquard waistband
  • Fully functional fly
  • Flatlock seams for next-to-skin comfort
  • Machine wash, line dry
  • Naturally UV absorbent to eliminate shine

How It's Built

  • Material: Aerowool
  • Cut: Athletic
  • Primary Uses:
    • Spot & Stalk
    • Tree Stand
    • Waterfowl
    • Upland
    • Fishing
  • Material Weight: 200 Lightweight
  • Weight: 6oz.

Where to Use

  • Temperature Range:
    • 20F - 45F
    • 45F - 60F

Customer Reviews

Based on 26 reviews
Product Size: L
Height: 6’ 2”
Weight: 190
Fit Comments: Fits me perfectly
Location: Eagle River Alaska
Primary Use: Hiking, work, daily wear, outdoor adventures
Great cold weather addition

I have been wearing these almost daily this winter and they have not disappointed. They have traveled with me on glacier hikes, shoveling snow, outdoor work and daily wear around town. In temperatures from 30 degrees F to -17 degrees F they have warded off the cold. I usually wear these under a pair of cargo pants or under my uniform for work. They are comfortable and I forget that I am wearing them fairly often. Unlike other thermals I have worn these do a good job at adjusting to warmer temperatures when you get indoors out of the cold. They can still get toasty indoors, but less so than other brands I have tried. If you are working in -5 degrees F or lower you might want to look at a pair of firstlite’s thicker thermal offerings in my opinion. These have worked great for me and I have no regrets with my purchase. They fit comfortably and don’t tent to fall down through the day. They have also held up well through multiple trips through the washing machine. buy with confidence.

Product Size: L
Base layer

They fit as they should and perform even better. Keeps you nice and warm

Product Size: L
Height: 6’4”
Weight: 170
Location: Mo
Primary Use: Every day use

Nice base layer they keep you warm. Almost a little to warm for me in the upper 20’s moving around. Will work nice on the cold mornings in the stand though.

Product Size: M
Height: 5'9
Weight: 160
Location: Idaho
Primary Use: Hunting and Everyday Use
Lives up to the hype

I've worn these for a few weeks now and I have to say, I'm impressed. I put these to the test on a recent goose hunt and they kept me regulated surprisingly well. After carrying 3 blinds and 3 dozen decoys a fair distance I was sweating like a pig. When I finally got to hanging out in the blind I didn't get that cold bite that would normally happen. Instead, I stayed warm the entire time. After the hunt, and stripping the waders, I was yet again drenched in sweat with temps around 30 degrees. Legs stayed warm and dried super quick, unlike a polyester top I was wearing. No sweat smell! These are great!!

Product Size: XL
Height: 6-0
Weight: 195
Fit Comments: Perfect and no shrinkage
Location: Southern and Central California
Primary Use: Huntung
MensFuse Long John

Perfect base layer for Southern California bird hunting. It’s cold in the mornings, but warms up during the day. It’s ideal for those 35-70 degree days, plenty warm but doesn’t make you sweat when the temps go up. I’ll buy more for sure.