Soft and stretchy Icebreaker® Merino 150 Siren Bikini with a modern slim fit, the Siren Bikini features our Corespun Merino wool blend and provides enough coverage with the best possible fit and shape for go-to, everyday comfort. Cool-Lite - Lightweight and breathable fabric blend that's cool to the touch and quick drying. Merrow seams with a flat finish support friction reduction. Merino Corespun - merino blend regulates body temperature in all weather conditions.