Comfy underwear bottoms for everyday wear, the Merino 150 Siren Hipkini features icebreaker's lightweight corespun merino jersey fabric that’s stretchy and soft next to your skin. The low-profile elastic waist and leg openings offer a comfortable fit, and the low-profile side seams maximize comfort. Inspired by nature, icebreaker harnesses the performance qualities of natural fibres to offer an alternative to clothing based on petrochemical synthetics. Merino is an annually renewable fibre that naturally resists odours, keeps you cool when it’s hot and warm when it’s not, and lets your skin breathe for comfort all day, every day.