Snug in all the right places and made to last, the Icebreaker 250 Vertex Long-Sleeve Half Zip Top is the first step to guaranteed comfort on the slopes no matter the conditions. Sewn up from soft merino fibers, this half-zip top has gusseted underarms for total freedom of moment and is naturally odor-resistant and temperature regulating. Whether you want to be cool as a cucumber or toasty warm, it all starts with a good base layer.