The key to staying warm on a cold ride is to stay dry and to hold on to the warmth that our bodies generate while riding. We use a light weight, pliable 3-layer fabric with a wind shielding, breathable membrane on the front of our vests. We use a stretch fabric on the side panels so that the vest compresses on your body, virtually eliminating any flapping fabric. On the back of the vest, we use a breathable, stretch fabric so that you don't overheat. We also engineer our vests with 3 rear pockets.