Sexy or not, you decide. But we can’t resist sharing this wonderful piece of wearable tech with the ladies. The new Kaiteki Navi Wacoal bras and panties feature unique “polymers” that help regulate temperature. When temperature is above 25 degrees Celsius, the polymer melts and turns liquid, absorbing heat and keeping your body cool. And when temperature goes below 25 degrees Celsius, the polymer solidifies and releases heat, keeping your body all warm and fuzzy.

The Kaiteki Navi Wacoal lingerie should be available this month, with prices ranging from 1900 Yen to 8000 Yen (US$16 to US$67). The line will include t-shirts, camisoles, bras and panties.