Men's Base Layer Long sleeve tops

Our versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is our best-selling base layer top.

Our versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Long Sleeve Crewe is our best-selling base layer top.

Setting the standard for all others to follow, the 200 Oasis Long Sleeve Crew is icebreaker's best-selling base layer—a versatile active top for year-round layering and everyday comfort.

The benchmark against which all others are judged, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric for year-round layering performance across any activity.

The benchmark against which all others are judged, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric for year-round layering performance across any activity.

The benchmark against which all others are judged, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric for year-round layering performance across any activity.

Setting the standard for all others to follow, the 200 Oasis Long Sleeve Crew is icebreaker's best-selling base layer—a versatile active top for year-round layering and everyday comfort.

Setting the standard for all others to follow, the 200 Oasis Long Sleeve Crew is icebreaker's best-selling base layer—a versatile active top for year-round layering and everyday comfort.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric for year-round layering performance across any activity.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile merino wool jersey fabric for year-round layering performance across any activity.

Our versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Short Sleeve Crewe is our best-selling base layer top.

Our versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Short Sleeve Crewe is our best-selling base layer top.

Our versatile, go-anywhere shirt made from breathable 100% merino wool jersey, the 200 Oasis Short Sleeve Crewe is our best-selling base layer top.

Setting the standard for all others to follow, the 200 Oasis Short Sleeve Crew is icebreaker's best-selling base layer—a versatile active top for year-round layering and everyday comfort.

An elevated, sportier version of our best-selling base layer, the 200 Oasis+ Long Sleeve Crewe is a versatile top that make the perfect foundation for your everyday year-round layering system.

An elevated, sportier version of our best-selling base layer, the 200 Oasis+ Long Sleeve Half Zip Hoodie is a versatile top that make the perfect foundation for your everyday year-round layering system.

An elevated, sportier version of our best-selling base layer, the 200 Oasis+ Long Sleeve Crewe is a versatile top that make the perfect foundation for your everyday year-round layering system.

An elevated, sportier version of our best-selling base layer, the 200 Oasis+ Long Sleeve Half Zip Hoodie is a versatile top that make the perfect foundation for your everyday year-round layering system.

Crafted from 100% merino wool and modeled after our best-selling base layer, the 200 Oasis+ Suit is a foundational piece built for explorers, with full-body coverage designed to keep you warm during long days outdoors.

A midweight baselayer designed for intense activity and made with 100% merino wool fabric, the 200 ZoneKnit™ Long Sleeve Crew features our ZoneKnit technology for ample breathability.