Smartwool Women's base layer Twilight Blue Heather Merino 250 1/4 Zip - Small. Excellent preowned condition. See photos for measurements. Fitted, warm top for layering. SW016373 Engineered with itch-free, temperature-regulating merino wool, SmartWool's Merino 250 base layer top ensures you'll stay warm and comfortable in the snowy outdoors. Itch-free merino wool is temperature regulating, moisture wicking and odor resistant Interlock knit construction Zip neckline Patterned collar and raglan sleeves Chafe-free flatlock seams Base layer weight: Midweight