Smartwool Women's Classic Thermal Merino Base Layer 1/4 Zip. Worn twice. We've updated the fit of our Women's Classic Thermal Merino Base Layer 1/4 Zip to improve functionality while also enhancing aesthetics. As one of our heaviest base layer tops and one of our best base layers for cold weather, this garment uses 100% responsibly sourced Merino wool, shoulder panels, and a flatlock seam construction to help minimize chafing as well as keep you comfortable and temperature regulated as you enjoy high-intensity skiing, hiking, running, and more. Slim Fit 100% Merino wool fabric made with an interlock knit for enhanced comfort, breathability, thermoregulation, and odor resistance Fit updated to improve functionality while enhancing aesthetics for a range of body shapes Back body seam wraps to front for body-enhancing fit Crew neck with raglan sleeves Flatlock seam construction designed to minimize chafing 8" (20 cm) center front zip with semi-locking slider Knit in China: 100% Merino Wool Garment Weight: 236 g = 8.32 oz Style: SW016373 Care: Machine Wash Warm Gentle Cycle. Do Not Iron Decorations. Do Not Bleach Tumble Dry Low Cool Iron As Needed Do Not Dry Clean Wash With Like Colors