1.- LARGE HEAT COVERAGE. The foot heating wrap features full coverage heat to heal front and back foot pain area, helping you to get relief from achilles tendonitis, planter fasciitis, heel pain, ankle sprain... 2.- ONE SIZE FITS ALL: Universal sizing for left or right foot. Sufficient heating area to cover Ankle, Achilles & Plantar pain area, comes along with spiky outer layer massage ball for foot massages / plantar fasciitis, stimulating effect, increasing circulation for quick recovery 3.- COMFORTABLE: The brace is made of durable neoprene which is supportive for foot injuries. Premium quality fleece in the inner layer make a soft touch for your skin 4.- EASY TO OPERATE & 3 HEAT SETTINGS: Long press the button for 3 seconds to turn it on / off. Each short press will cycle through the temperature setting: red-highest Tem (65℃/149℉ to 75℃/167℉), blue-medium (55℃/131℉ to 65℃/149℉), green-lowest temp (40℃/104℉ to 60℃/140℉) setting. Short press the button for once can change to another heat setting