What Our Gearhead® Experts Are Saying:"I reach for the Siren Hipkini Snow Day Underwear when I want lightweight coverage that feels like a second skin. It’s soft, stays in place, and the skier print is just plain fun—perfect for layering under everything on ski days or trail hikes."For base comfort that moves with us through every season, we count on the Merino 150 Siren Hipkini Snow Day Underwear. Icebreaker’s Corespun merino blend delivers all the breathability and anti-odor performance we love, now in a fun-loving snow-themed print that celebrates our mountain obsession. The low-bulk hipkini cut hugs just right without pinching, thanks to a hint of elastane and a smooth, tag-free design. We wear it year-round—from long hikes to chilly resort days—and it stays comfortable whether we’re layering up or cooling down. Cozy, moisture-wicking, and ready for movement, this is one baselayer bottom we keep in constant rotation.