Two-layer, warm Merino base layer top for use in cold weather. The perfect choice for frosty days! - The two-layer Aquaduct structure helps moisture transfer to outer layers - The layers are knit together, meaning you won't even notice the structure - 235g/m² material weight - Machine wash at 40ºC, follow the wash tag's instructions *Did you know?* While regular lamb's wool has relatively large scales, Merino wool is very smooth. Thanks to this, many who avoid regular wool apparel can wear Merino apparel.