I've run early morning commutes, 40 minutes in 34 deg. temps with heated grips and light weight gloves on a regular basis. I added the air deflectors, and was amazed at the difference they made, and would call them essential. My gloves stay dry in the wet and the wind doesn't suck the heat out of my hands. I like the grip / feel of the light gloves, and the heated grips and deflector is my winning combo.