Smartwool Classic Thermal Merino Base Layer 1/4 Zip - Women's Charcoal Heather Extra Small. As one of our heaviest base layer tops and one of our best base layers for cold weather this garment uses 100percent 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. Specifications for Smartwool Classic Thermal Merino Base Layer 1/4 Zip - Women's: Manufacturer: Smartwool Sleeve Length: Long Sleeve Age Group: Adults Apparel Fit: Slim Gender: Female Application: Baselayer Top Fabric/Material: 100percent Merino Wool Weight: 8.32 oz Fire Resistant: No Features of Smartwool Classic Thermal Merino Base Layer 1/4 Zip - Women's Our slim fit is intended to follow the contours of the body Fabric helps combine the moisture management temperature regulation and odor resistance of 100percent Merino wool with interlock knit for comfort Back body seam wraps to front Raglan sleeves Flatlock seam construction designed to help increase comfort and minimize chafing Package Contents: Smartwool Classic Thermal Merino Base Layer 1/4 Zip - Women's Smartwool SW00282801010XS000: Classic Thermal Merino Base Layer 1/4 Zip - Women's Charcoal Heather Extra Small