Whether you're layering up for a cool morning trail run or tossing something on post-hike, the Microdini Half-Zip is our top pick for women who want warmth without bulk. The recycled Micro D fleece body moves with you and traps heat fast, while the Houdini ripstop nylon yoke adds light wind and weather resistance where you need it most. The half-zip lets you manage temperature on the go.

• Recycled polyester Micro D fleece body delivers soft, immediate warmth without the weight of a traditional midlayer
• Houdini recycled nylon ripstop yoke with PFAS-free DWR finish sheds light wind and moisture at the shoulders
• Set-in sleeves reduce pack-strap chafe and give you full arm range of motion on the trail or at the crag
• Elastic-bound cuffs and hem seal in body heat and block cold drafts — no bunching, no bulk under a shell
• Left-chest zip pocket secures your keys, cards, or lip balm; made in a Fair Trade Certified factory