Designed for active pursuits in warm weather, this Icebreaker T-shirt made from 100% merino wool is a piece of technical base layer clothing that combines natural temperature regulation with odor resistance. Its flatlock seams and underarm gussets minimize chafing and maintain freedom of movement, while the extended back hem provides better coverage during prolonged exertion.
Designed for men who enjoy active outdoor pursuits, the Icebreaker M 200 Oasis SS Crewe T-shirt is a merino wool base layer designed to accompany everything from hiking and climbing trips to days on the slopes or travel. Its lightweight 200 g/m² weight makes it highly versatile in varying temperatures. The short-sleeved cut and crew neck make it a discreet yet effective garment, just as comfortable under a technical jacket as it is when worn alone during strenuous activities.
Made from 100% merino wool sourced from the Southern Alps of New Zealand, the M 200 Oasis SS Crewe leverages the natural properties of this fiber to regulate body temperature based on the intensity of your activity. Merino wool absorbs and wicks away moisture, promoting quick-drying that maintains a comfortable feel even during intense activities. Its natural breathability minimizes feelings of stuffiness, whether on a summer hike or a ski tour. The 200 gsm weight, known as “lightweight,” strikes a balance between lightness and mild insulation, suitable for both cold conditions and activities that generate heat.
Flatlock seams reduce friction points against the skin during repetitive movements—a particularly useful feature when worn under a backpack or climbing harness. Integrated underarm gussets increase range of motion without restricting the fabric, making technical movements easier while climbing or on a route. The back hem, slightly longer than the front, ensures better back coverage when the torso is bent forward. The shirt weighs approximately 171 g in size M, making it easy to pack in a travel kit or include on a trail running gear list.
Merino wool offers natural odor resistance, a useful feature during extended outings where washing opportunities are limited. This property does not rely on any added chemical treatments—it is inherent to the fiber’s structure. The natural UV protection provided by the wool is an added benefit during sun-exposed activities, such as cycling, high-altitude hiking, or rock climbing. Available in the “Undyed” color, the T-shirt retains the fiber’s natural hue, without any added dye.
The Icebreaker M 200 Oasis SS Crewe T-shirt is available in sizes S, M, L, and XL as part of the Winter 2027 collection.
icebreaker® is the undisputed leader in technical outdoor apparel made from merino wool (thermal underwear, base layers, mid-layers, socks, and more). It has revolutionized athletic apparel by proving that nature does it better than synthetics. Whether hiking, skiing, trail running, or camping, icebreaker® offers natural fabrics that adapt to any terrain—without a single plastic fiber.
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