Kidneykaren Single-Jersey Kidney Warmer. Extra warm for particularly cold days. The NILIT-Heat used, a unique yarn made from coffee activated charcoal, provides natural insulation and pleasant warmth. This fiber has excellent antibacterial and thermal insulating properties, as well as a strong deodorizing effect, ensuring maximum wearing comfort. Perfect for any occasion - in everyday life, during sports, and on the go. Kidneykaren extends every top and is a true all-rounder - also usable as a hip warmer or mini skirt. The snug warmer in stretch quality is comfortable to wear, as it is made in one piece without bothersome side seams and does not add bulk. Soft, shape-retaining, and particularly stretchy.