Women’s Merino 150 Siren Hipkini

Icebreaker designed the Siren Hipkini to solve the friction and irritation caused by stacked seams under loaded pack hipbelts. Sitting low on the hips with minimal rise, the cut stays tucked out of the way of harness straps and rigid pack waistbands. It offers a trim, secure fit that stays put without digging into the skin, making it a dependable foundation for high-mileage trail days, running, and backcountry travel where chafe prevention is critical.

Construction centers on Icebreaker's 150-weight corespun jersey, a blend that wraps fine merino wool fibers around a nylon filament core with a touch of elastane for stretch recovery. This spinning method preserves merino’s signature temperature regulation, next-to-skin softness, and multi-day odor resistance while bolstering the structural integrity of the ultralight knit. In active use, it manages perspiration well and maintains a neutral microclimate even when wet, though it inevitably dries a step slower than a pure polyester or nylon brief.

Compared to classic synthetic options like the Patagonia Barely or ExOfficio Give-N-Go, the Siren Hipkini trades ultra-fast dry times for vastly superior odor control on trips where trail laundry is impossible. As with any lightweight wool garment, mechanical abrasion and careless laundering will shorten its lifespan. For backpackers willing to treat it gently, it remains one of the most reliable and unobtrusive technical underwear options on the market.