Icebreaker Merino 150 Siren SS Sweetheart - Women's Black Small. Specifications for Icebreaker Merino 150 Siren SS Sweetheart - Women's: Manufacturer: Icebreaker Sleeve Length: Short Sleeve Apparel Fit: Slim Gender: Female Application: All Purpose Fabric/Material: 83percent Merino Wool 12percent Nylon 5percent Lycra Weight: 1 lb Neckline: Scoop Neck Features of Icebreaker Merino 150 Siren SS Sweetheart - Women's Merino Corespun - merino blend regulates body temperature in all weather conditions. Package Contents: Icebreaker Merino 150 Siren SS Sweetheart - Women's Icebreaker IB103062001S: Merino 150 Siren SS Sweetheart - Women's Black Small