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Icebreaker Oasis thermal base layers are what they’re famous for. These best-sellers are designed to contour the body and will easily flex with you, allowing maximum movement, whatever the activity. Not too heavy, not too light, it is made from 100% merino midweight jersey, making them your go to base layers for year-round layering and everyday comfort. Enjoy the natural benefits of merino, including odour resistance and temperature regulation, keeping you warm whilst not overheating.