Mixing merino wool with recycled polyester, the Smartwool Active Lined 8in Short feels soft against our skin, fights funky smells, and regulates our body temperature when we're out there being active. This lightweight short features a Merino Sport boxer brief liner that's naturally odor-resistant while the polyester-merino blend is breathable, moisture-wicking, and quick-drying to keep us as fresh and dry as possible.