Designed for active women looking for a versatile base layer, the Icebreaker M 200 OASIS LS Crewe Moss BloomAOP is perfect for everything from mountain outings to days of skiing or hiking. Made from 100% merino wool, it combines natural temperature regulation with moisture-wicking properties to maintain lasting comfort during intense activities. Its slim fit and meticulous construction make it a base layer top that’s just as effective under a jacket as it is when worn on its own.

The merino wool in the Icebreaker M 200 OASIS LS Crewe ensures thermal comfort

Merino wool fibers have a natural ability to regulate body temperature in all weather conditions: they keep you warm when temperatures drop and help keep you cool during sustained exertion. This inherent property of the material prevents the sudden temperature fluctuations often experienced with synthetic fabrics. At the same time, the fiber wicks moisture away from the skin, minimizing the feeling of dampness during exercise. With a weight of 217 g for a Medium size, this top offers a balance of lightness and insulation ideal for winter activities.

A design crafted to reduce irritation and preserve freedom of movement

Flatlock seams and offset shoulder seams minimize friction points—a detail that’s especially appreciated during long days backpacking or wearing ski gear. Gussets under the arms complement this design by allowing for a greater range of motion without restriction. The back hem, slightly longer than the front, ensures better coverage in all positions, even while moving.

A natural fabric, free of synthetic fibers

The merino wool used is selected to be free of plastic microfibers and petrochemical-derived materials. Naturally odor-resistant, it allows you to wear this top for several consecutive days without any loss of freshness, which is a real advantage when backpacking or traveling. The fiber is also renewable, recyclable, and biodegradable under certain conditions—attributes that reflect a material approach consistent with current outdoor practices. Care is simple: just machine wash cold on a delicate cycle, without fabric softener or tumble drying.

The Icebreaker M 200 OASIS LS Crewe Moss BloomAOP midlayer is available in sizes XS through XL and is suitable for both everyday use and demanding winter activities.