Flume Baselayer Bottoms - Men's


Made of the same material as our award winning Flume Baselayer (twice named the overall best hiking base layer by Field & Stream), these bottoms are made of a blend of Tencel (made from trees!) and spandex.  Tencel is naturally wicking, naturally odor resistant, thermo-regulating, and crazy comfortable. The perfect base layer for hiking, climbing, skiing, or just staying warm on a cool day.

Our Flume Baselayer bottoms were hand-stitched in our Gorham, NH facility.

Weight in ounces:
XS: 4.8
S: 5.1
M:  5.5
L: 5.8

XL: 6.0

XXL: 6.3


Please note these baselayers have a tremendous amount of stretch.  If you are between sizes, please order the smaller size.  The 'relaxed' waist of these products are 1-2" less than what you see indicated.

Waist/Inseam in inches:
XS: 29-30 / 28
S: 30-32 / 28
M: 33-34 / 29
L:  35-37 / 29
XL: 38-40 / 30
XXL: 40-42 / 30

Made in the USA:
Crafted in Lincoln, NH, Gorham, NH

4 way stretch for superior movement and fit
Flatlock stitched to reduce chafing - smooth on your skin
Made in the USA!
Texollini (Long Beach, CA)
91% Tencel, 9% Lycra

Machine Wash Cold with like colors, gentle cycle
Do not dry clean
Do not bleach
Tumble dry low or lay flat to dry 


Customer Reviews

Based on 5 reviews
Matt L. (Manchester, US)

Flume Baselayer Bottoms - Men's

John M. (Deer Park, US)

Crazy smooth fabric. Abundant stretch and they work. Just came back from a few zero degree nights in the Presidentials, they did not come off my legs. These disappear under your layers. Just be sure to follow their specific instructions for sizing.

John S. (Ravena, US)
So comfortable, runs big

Had to try these after loving the tops hiking this year. Ordered a med as that’s my size in everything pants 180# 5’11” but had to exchange for a small. Small fits perfect and they exchanged for free very quickly I had the replacement. These may be my new go to base layers. Once true winter comes to the east will find out!

Gary C. (Wilmington, US)
So comfortable!

The base layer bottom is a fabulous product. I use it mostly for skiing. I have three other major brand name long underwear/base layers and none comes close to the comfort level of this really great Burgeon product. It’s a great addition to the Burgeon product line. You can’t imagine just how good it is until you feel the comfort!

Jim (Meredith, US)
So comfortable

Bought these two weeks ago and have already had them on the trail 4x. They are so comfortable - best long underwear I have. The stretch in them is amazing, I could barely tell I was wearing them even over the rough terrain around Madison & Adams. Love them. They'll be with me on all my winter 4000 footers!