Calf muscles can cool down quickly, particularly after short pauses and even if the overall body is still heated. This can lead to the risk of injury. The ISO CalfPad™ retains the body‘s warmth. Here too the knitted fabric settles itself in a wavy shape over the skin, forming channels for storing air in a manner similar to the ISO-Shoulder™. The body-temperature air retained in these channels decisively delays the cool-down of the calf musculature and adjusts to the body‘s overall perception of warmth.