Icebreaker Merino 150 Siren Tank - Women's Lichen Extra Small. Specifications for Icebreaker Merino 150 Siren Tank - Women's: Manufacturer: Icebreaker Apparel Fit: Slim Gender: Female Shirt Style: Active Fabric/Material: 83percent Merino Wool 12percent Nylon 5percent Lycra Weight: 1 lb Features of Icebreaker Merino 150 Siren Tank - Women's Merino Corespun - merino blend regulates body temperature in all weather conditions. Package Contents: Icebreaker Merino 150 Siren Tank - Women's Icebreaker IB103213A74XS: Merino 150 Siren Tank - Women's Lichen Extra Small