The Icebreaker Women's Long-Sleeve BodyFit 150 Siren Sweetheart Top is so light and soft that it feels like you're wearing a cloud. Merino wool gives this casual baselayer a breathable feel that fights odors and it has a touch of Lycra that offers some comfortable stretch. All year long this ultralight V-neck top flatters your figure whether you're running around town or relaxing on the couch.