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 146 reviews
Huck (New Britain, US)
Flume 1/4 zip base layer

I am extremely pleased with the high quality fabric and construction. It is comfortable and provides the perfect layer I was looking for. I have worn it on multiple hikes and while mountain biking. It has held up to my rigorous standards. I highly recommend this product for all your outdoor needs. I am so very happy to support a local business.

Michael W. (Marshfield, US)
Flume baselayer

Second baselayer, really appreciate that they come in tall sizes. The thumb holes are pretty helpful too when putting on a jacket or sweater so sleeves don't end up by your elbows.

Customer (Lincoln, US)
Nice base layer

Great shirt. Comfortable and well made.

Holland W. (Nampa, US)
Flume 1/4 Zip Baselayer

Very soft, well constructed and warm. Nice fit that is not overly tight

Mike (Brooklyn, US)
New version/fabric is even better

I have the original version and the new one. Both great but I like to new fabric even better.