They are made of soft, comfortable fabric that is lightweight.
You can charge them directly from a wall socket or using a USB cord connected to other devices.
The heating elements are made of carbon fiber which has a high heat tolerance making them durable.
You can recharge their batteries when drained saving you the cost of battery replacement.
Their batteries are located below the calf not to disrupt your comfort.
You will get notified when to charge the batteries when the indicator lights on their batteries turn red.
The seams in which the wires running from the battery are located unravel after some time causing the wires to be exposed.