The soft bath tub can be realized with new flexible bath tub materials. When lying on it, it feels comfortable from its cushioning according to the body structure and its remarkable thermo keeping ability. Calla BATHTUB’s cooling down speed is a quarter of the normal bath tubs and helps one to feel warm and cozy like inside the mother’s body, even when they stay in the tub for a long time. Graft these soft material’s womanlike feelings with an elegant line of the Calla flower, it generates a luxury tub design. The flower’s moderated curved line gives more beauty to the form, which also makes the user comfortable by the naturally lowered middle part.