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A witch's dress, a cat costume or a vampire cape looks great on Halloween night, but none of them keeps you warm. A fitted merino base layer underneath does. This collection brings together women's long sleeves, thermal sets, pants, beanies and socks that sit close to the body and slip under almost any costume without showing.

Our tops, pants and sets are made from 17.5 micron Australian merino, fine enough to wear against the skin without itch. Merino holds warmth when you sweat on a long trick-or-treat route or at a party, and resists odor, so the same layer works the next morning. Choose your weight by the night ahead: 165 GSM for mild evenings and indoor parties, 250 GSM for most October nights outside, 320 GSM for real cold.

Halloween offer through November 1: 15% off everything, a free merino neck gaiter on orders $120+, and 20% off orders $200+. Applied automatically at checkout, no code needed.

Need ideas for what to wear? Read our guide to staying warm in a Halloween costume, or dress the whole family with kids' merino layers.