For those who have everything: Thermoregulatory sweater

The Mercury V-Neck ($168) from Ministry of Supply is not just a sweater. It's a thermoregulatory sweater that uses a NASA spacesuit technology to adjust to changing temperatures, says Sarah Wexler at Popular Mechanics. The Mercury is made from a moisture-wicking wool-acrylic blend, and paraffin is embedded in each fiber. When you heat up, the waxlike paraffin softens and lets warmth escape; when you're cold, it solidifies and traps heat. The full-phase change takes about seven minutes, but letting your sweater adapt to a warm room proves "much easier than opening a window." The robots that knit it even include ventilation panels at the armpits.
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