Women's Base Layer Long sleeve tops

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

Our versatile 100% merino wool base layer top with a classic scoop-neck design, the 200 Oasis Long Sleeve Scoop combines casual comfort with technical performance.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Crew is a comfortable base layer top that make the perfect foundation for year-round layering.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Crew is a comfortable base layer top that make the perfect foundation for year-round layering.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Crew is a comfortable base layer top that make the perfect foundation for year-round layering.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Crewe Moss Bloom AOP is a comfortable base layer top that makes the perfect foundation for year-round layering. Inspired by the dense, verdant textures of moss, the all-over print captures the organic patterns of nature.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Crewe Moss Bloom AOP is a comfortable base layer top that makes the perfect foundation for year-round layering. Inspired by the dense, verdant textures of moss, the all-over print captures the organic patterns of nature.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Crewe Moss Bloom AOP is a comfortable base layer top that makes the perfect foundation for year-round layering. Inspired by the dense, verdant textures of moss, the all-over print captures the organic patterns of nature.

Setting the standard for all others to follow, the Merino 200 Oasis Long Sleeve Half Zip features our most versatile 100% 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 V Neck 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 V Neck 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 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 High Neck 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 High Neck 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.

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

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