I love merino wool, especially Smartwool's products, and this is no exception. Good fit, stays odor free (like all good merino wool products), breathable, wicks well, and packs down to nothing. It's not as warm as some other balaclavas might be, but it's much more packable than those. If you need more warmth, throw on a toboggan or hood--this product is easy to layer with other insulation layers. One of my favorite pieces of gear.