Shop sustainable merino wool shirts for men at icebreaker. icebreaker men's outdoor shirts are highly versatile and naturally resist odor, even after days of wear. They help you stay warm in the cold and cool in the heat, and can be worn solo or as a highly insulating base layer or mid layer. Our selection of merino wool shirts for men are the perfect companion for any outdoor activity. Our men’s outdoor shirts have a classic look, perfect for either the stylish or the rugged man, with performance every man is looking for. Our merino wool shirts for men come in a variety of colors, styles, and patterns. Don’t forget about our mens pants to complete your look!