Siren Tank – Women's

Built for active days in the heat, the Siren Tank is our pick for trail runners and outdoor athletes who want a base layer that breathes and doesn't quit. Lightweight 150-weight merino wool pulls moisture away and resists odor naturally, so you stay fresh through long efforts. The slim fit layers clean under a pack or shell.

• 100% merino wool at 150-weight — light enough for warm-weather runs and hikes without overheating
• Natural odor resistance means you can wear it hard and pack it again without issues
• Slim fit sits close to the body for clean layering under a vest, pack, or shell
• Available in multiple colorways including Snow, Grape, Kyanite, and Gritstone Heather — XS through XL
• Responsibly sourced merino from a brand with a long track record of ethical wool practices