Smartwool Women's Thermal Merino 1/4 Zip Boxed Long Sleeve Base Layer Shirt - An updated fit of the Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of the heaviest base layer tops and one of the best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels and a flatlock seam construction to help prevent chafing as well as keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running and more. Slim fit intended to follow the contours of the body 100% Merino wool fabric made with an interlock knit for comfort, breathability, thermoregulation and odor resistance Back body seam wraps to front Raglan sleeves Flatlock seam construction designed to help increase comfort and minimize chafing Style: SW002829