37.5® Technology helps keep your body at the ideal core temperature of 37.5° C. It’s scientifically proven to increase stamina by reducing the amount of energy used to manage your core temperature.
Everything thing Four Laps makes is Best in Class”
Great fit, lightweight, comfortable, and collar holds its shape well.
I've only worn it once so far but the fit is amazing and the fabric is very light without being see-through. Fit is tapered for an athletic body type, no parachute here. Would happily order more if there were more colors available in my size.