Best Merino 200 Oasis LS Half Zip Baselayer – Long Sleeves

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This lightweight, odour-resistant, and versatile base layer is a reliable choice for outdoor enthusiasts who face a variety of conditions.

Icebreaker says: 

The 200 Oasis base layer range is the benchmark against which all others are judged. The Long Sleeve Half Zip is made with icebreaker’s most versatile Merino jersey fabric for year-round layering performance whatever the activity.

Our Verdict

The Icebreaker Merino 200 Oasis LS Half Zip is a benchmark in base layers. It combines natural temperature regulation and odour resistance with a lightweight and durable design. It is a versatile year-round piece, perfect for layering during colder months or wearing solo in milder conditions.

Made from 100% merino wool, it provides warmth while maintaining excellent breathability. It is lightweight yet durable at 240g (size M), and its natural fibres excel at wicking moisture and resisting odour. Design features like a half zip for adjustable ventilation, gusseted underarms for mobility, and flatlock seams to minimise chafing ensure both comfort and practicality during active use. The drop-tail hem adds extra coverage, which is ideal when wearing a pack.

The fit is snug, offering efficient moisture management, but those planning to layer over thicker garments may consider sizing up. It performs exceptionally well in regulating body temperature during high-output activities and longer trips, where comfort and functionality are paramount.

– Reviewed by Ultralight Outdoor Gear

Features

• 100% Merino – Soft, lightweight and naturally odour resistant fibre that keeps you warm when it’s cold and cool when it’s warm
• Gusseted underarms for mobility and comfort
• Offset shoulder seams to help reduce friction
• Flatlock seams to help reduce friction
• Drop tail hem for added coverage

Specifications

• Small weighs: 232g
• Medium weighs: 240g
• Large weighs: 249g
• XLarge weighs: 256g

Material & Construction

• Fabric main: 200gm2 Merino Jersey, 100% Merino wool
  Fibre micron: 18.9µ

Help & advice:

• The Benefits of Merino Wool
• Ethical Wool