This stops cold the risk of overheating with the X-BIONIC Womens Summerlight Jersey.Ride longer and faster without overheating. This is made possible thanks to the patent and unique internal insulating pad that runs along the length of the spine. It simulates the body to prevent overheating and allows early sweat production to kick in. Thanks to preventive cooling, extreme temperature spikes and energy-sapping overheating is avoided.