The Women’s Merino 250 Half-Zip Hoody by Smartwool is a lightweight-yet-warm insulating top that breathes easy when you work up a sweat. Hit the trails with the ultimate layer, in a merino wool body that wicks moisture and regulates your core temperature – cool when hot, warm when cold. The interlock knit is made to last. No shoulder seams and flatlock seam construction ensure maximum comfort.