Optimum heat last for 20 mins, comfortable heat therapy, gentle steam, soft and breathable. This item included 6pcs in a box. Designed to provide soothing warmth that helps relax muscles, reduce tension, and promote a sense of calm, to enhance quality sleep and advocate holistic self-care. Heat is applied on the knees and accelerates blood circulation in the knee area, relieving pain and discomfort. Innovative hollow butterfly-shaped cut. Large area coverage that fits the knee, convenient for daily activities such as bending and walking. Four heating pads fully cover the knee joint area, providing 360-degree heat application. Store in a cool and dry place Singapore