Smartwool's Women’s Merino 150 Base Layer Bottoms are the perfect layer to put on for your warm-weather adventures. Made of lightweight, breathable Merino, these base layer pants have an updated fit that improves functionality while enhancing aesthetics for a wide range of body shapes. they wrapped their super-soft, responsibly sourced Merino around a nylon core to give it added durability, so it can keep up with you. Wherever you're going and whatever you're doing, their lightest-weight base layer bottoms are perfect for adventures during all seasons.