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.

Buying Guide: Baselayers

What you need to know about base layers

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

How to Choose Base Layers & Long Underwear

How to Choose Base Layers & Long Underwear

What you need to know about base layers

What to Wear & How to Dress for Skiing & Snowboarding

Men's Pro Team Thermal Base layer with Collar

Thermal Seamless Base Layer Top - Petrol Blue

What Is a Base Layer Shirt?. Nike AT

What you need to know about base layers

Shoppers Love This Base Layer Set