Pearl Izumi's warmest pant, the Summit AmFib, keeps us warm through the doldrums of winter, whether we're commuting by fat bike or out for that very last trail ride of the year. The Summit AmFib employs Pearl's own Elite AmFib Softshell, with a fleecy backing, to insulate against the chill and provide a water resistant outer. This stretchy fabric gives us a wide range of motion for our pedaling pursuits, while the tapered ankle keeps out of the way of our crankset.