Flume Crewneck Baselayer - Men's


Size Guide

Flume Crewneck Baselayer

Named the overall best hiking shirt by Field and Stream in 2021 and 2023, the Flume is a blend of Tencel (made from trees!) and spandex.  Tencel is naturally wicking, naturally odor resistant, thermo-regulating, and crazy comfortable. The perfect baselayer for hiking, climbing, skiing, or just staying warm on a cool day.

40 UPF.

Weight in ounces:
S: 7.2
M: 7.6
L: 8.0

LT: 8.6
XL: 9.0

XLT: 9.2
XXL: 9.4


Made in the USA:
Crafted in Lincoln, NH; Fall River, MA

4 way stretch for superior movement and fit
Extended length ensure coverage when active - no more exposed lower back!
Thumb loops for secure hand coverage
Raglan sleeves for superior movement
Flatlock stitched to reduce chafing - smooth on your skin
Made in the USA!
Texollini (Long Beach, CA)
91% Tencel, 9% Lycra

Wash with like colors
Machine Wash Cold
Gentle Cycle
Do not bleach
Lay flat or hang to dry

Sizing - the sizing for this product is mens

Customer Reviews

Based on 162 reviews
Chris M. (Somers, US)
Great top

Outstanding base layer. Buying second top bc they are so useful

J.C. (Shrewsbury, US)
Love it

Awesome quality, super comfortable, very capable. And, ah, somehow also extremely flattering if you happen to have that dad bod build. I use it all the time!

Tina D. (Chichester, US)
Base layer

Love my Flume Crewneck baselayer. Very soft material and keeps me warm on my hikes.

Kevin D. (Marshfield, US)
Favorite Piece of clothing

Not much else to say beyond the title. This is my second Flume, first crewneck, but the Flume shirt in any variety is literally my favorite piece of clothing I own. Super comfortable, versatile, stretchy yet fitting, never smells, can be layered with anything.

I need one of every color.

Customer (Summerville, US)

Flume 1/4 Zip Baselayer - Men's