What Is a Base Layer Shirt?.

A base layer shirt is the foundation of your workout gear, keeping you warm, dry and comfortable for any activity.

US Army Level 1 Base Level Thermal Undershirt [Genuine Army ECWCS]

Cold Weather Layering: Part 1 - How to Choose a Base Layer

What to Wear & How to Dress for Skiing & Snowboarding

Men's Pro Team Thermal Base layer with Collar

Why MESH is the WARMEST Baselayer possible

Men's Luxe Roll Neck Base Layer (Ocean Teal Blue)

KMDMerino Baselayer Women's Long Sleeve Top

Women's 100% Merino Wool Base Layer Long Sleeve Crew Neck Shirt

Athletic Works Men's Base Layer Mock Neckline Top, Sizes S-XL

Base Layers: What, When, and Why to Wear One