Icebreaker Men's Merino 200 Oasis Long Sleeve Half Zip Thermal Base Layer Top – Midnight Navy

For the outdoor enthusiast who demands versatility, the Icebreaker Merino 200 Oasis Long Sleeve Half Zip is your essential first layer, perfect for everything from frosty morning hikes to alpine ski tours. Its half-zip design allows for easy ventilation during high-output exertion, while the all-natural merino wool keeps you comfortable when the pace slows. Midnight Navy adds a sleek, understated look that pairs well with any kit.

Key specifications

• Product Type: Thermal Base Layer Top
• Gender: Men's
• Material: 100% Merino Wool
• Fabric Weight: 200 gsm (Lightweight)
• Fit: Slim Fit
• Sleeve Length: Long Sleeve
• Neckline: Half Zip
• Colour: Midnight Navy
• Layering: Base Layer
• Seam Construction: Flatlock Seams
• Underarm Gussets: Yes
• Hem Style: Drop Tail Hem
• Odor Resistance: Natural merino property
• Breathability: Yes
• Moisture Wicking: Yes
• Care Instructions: Machine wash cold, line dry in shade
• Intended Use: Snow Sports, Hiking, Adventure, Everyday Wear

Why choose it

Icebreaker sources 100% merino wool that is naturally breathable, odor-resistant, and regulates your body temperature across varying conditions. The 200 weight provides just the right amount of insulation for cool-weather activities without adding bulk. Flatlock seams reduce chafing when you're on the move, and the drop tail hem keeps you covered during dynamic movements. This is a sustainable, high-performance base layer that invests in your comfort.

Ideal use cases

• Cold-weather hiking and backpacking
• Skiing and snowboarding
• Everyday winter wear
• Travel and adventure trips

Good to know

Merino wool is a renewable fiber that naturally wicks moisture, so you stay dry during intense activity. The half-zip collar has a zipper garage to prevent chin irritation. Machine wash cold with like colours, and line dry in the shade. Avoid fabric softeners and bleach to maintain the performance of the wool.