An ultra-comfy underwear bottom for everyday wear, the Merino 150 Siren Hipkini Snow Day features our ultra-lightweight corespun merino jersey with a touch of elastane for stretch. A fun all over print of various snowboarders and skiers, making there way down the piste. Icebreaker Womens Mer 150 Siren Hipkini Ski Day Features: Merino Corespun - merino blend regulates body temperature in all weather conditions. A snug, close-to-body fit for low-bulk layering.