Icebreaker Men's 200 Oasis Short Sleeve Crew Base Layer Top - Gritstone Heather - XXL

On a crisp morning hike above the treeline, you need a base layer that works as hard as you do. The Icebreaker 200 Oasis Short Sleeve Crew is the original merino base layer, trusted by hikers, climbers, and everyday adventurers for its natural performance. Made from 100% pure New Zealand merino wool jersey with a fabric weight of 200 g/m², it offers the ideal balance of warmth, breathability, and next-to-skin softness. The slim fit hugs the body without restriction, while offset shoulder seams and flatlock stitching prevent chafing under pack straps. Merino wool naturally regulates temperature, wicks moisture, and resists odor, so you can wear it longer between washes. Whether as a standalone top in mild conditions or a foundation layer in colder weather, the Oasis crew delivers reliable comfort on every outing.

Key specifications

• Material: 100% Merino wool (200 g/m² jersey)
• Sleeve length: Short sleeve
• Neck style: Crew neck
• Fit: Slim fit
• Color: Gritstone Heather
• Size: XXL
• Odor resistance: Natural merino property
• Moisture management: Wicking
• Breathability: High
• Seam construction: Flatlock seams
• Shoulder seams: Offset to prevent chafing
• Recommended use: Hiking, layering, everyday wear
• Care: Machine wash cold (30°C), line dry in shade
• Fiber source: New Zealand Merino
• Thermal regulation: Adapts to temperature
• Softness: Non-itchy comfort
• Sustainability: Renewable and biodegradable fiber

Why choose it

Merino wool is nature's performance fiber. It keeps you warm when it's cool and cool when it's warm, all while staying remarkably soft against the skin. Unlike synthetic base layers, it resists odor buildup, so you can wear it multiple times between washes—perfect for multi-day treks or minimalist travel. The 200 g/m² weight is versatile across seasons, and the slim fit layers smoothly under midlayers and shells. Icebreaker sources its merino from high-country New Zealand stations, ensuring quality and ethical production. This top is a long-term investment in comfort and performance.

Ideal use cases

• Hiking and trekking in variable conditions
• Travel and everyday wear
• Layering under a fleece or shell in cold weather
• Active pursuits where breathability matters
• Odor-conscious situations like multi-day trips

Good to know

Machine wash cold on a gentle cycle with like colors, and line dry in the shade to preserve the wool's natural properties. Avoid bleach and fabric softeners. The Gritstone Heather colorway is a versatile neutral that pairs with any outdoor wardrobe. This garment is made from renewable, biodegradable merino wool, reflecting Icebreaker's commitment to sustainability.