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;