Product Profiles

By successfully combining natural clay minerals with high-quality cotton, we have created a special yarn that emits far-infrared rays and negative ions — introducing Rich Clay. It is currently patent pending in Japan. The main benefit of Rich Clay lies in its far-infrared effect, which helps promote blood circulation and gradually increases your body temperature, keeping you comfortably warm. Testing conducted by an official Japanese research institution has confirmed the yarn’s emission of far-infrared rays and negative ions. The concept is “Thin yet Warm.” While conventional winter socks tend to be thick, yarn made with Rich Clay allows heat to penetrate your body through far-infrared radiation, keeping you warm even with thin fabrics. In addition, we have prepared a special Rich Clay belly warmer, perfect for daily use as well as for wearing during sleep.