There is no better foundation to build than that of high-quality layering items. Once you get that down, the rest is bound to be a success, and the Smartwool Classic Thermal Merino Base Layer Pattern Plus Top is more than ideal to have in your lineup. Made from 100% Merino wool, the fabric does all the work for you from odor resistance for longer weekend trips to breathability and thermoregulation for optimal comfort on the slopes. Comfort like this is a clear choice.