Men's Base Layer Long sleeve tops

A heavyweight merino wool base layer top designed to help regulate temperature during high-intensity activity, the 260 ZoneKnit™ Long Sleeve Crewe features 100% and natural merino wool.

A heavyweight merino wool base layer top designed to help regulate temperature during high-intensity activity, the 260 ZoneKnit™ Long Sleeve Half Zip feature 100% and natural merino wool.

A heavyweight merino wool base layer top designed to help regulate temperature during high-intensity activity, the 260 ZoneKnit™ Long Sleeve Crewe features 100% and natural merino wool.

A heavyweight merino wool base layer top designed to help regulate temperature during high-intensity activity, the 260 ZoneKnit™ Long Sleeve Half Zip feature 100% and natural merino wool.

A lightweight performance baselayer that excels during high-output pursuits, the Merino Blend 125 ZoneKnit™ Long Sleeve Crewe combines light and breathable Cool-Lite™ fabric with our ZoneKnit™ technology.

An ultra-comfortable base layer top that feels like a second skin thanks to its slim-fit seamless design and highly breathable merino-blend fabric, the Merino Blend 260 ZoneKnit™ Seamless Long Sleeve Crewe features body-mapped mesh panels for added ventilation.