We're not prepared to claim that the Pearl Izumi Select Thermal Barrier Jacket has supernatural properties, but we can vouch for its ability to transform from a standalone top for the cool weather of fall, an outer layer for when the temperature gets a little lower, and then as the super domestique of base layers when winter shows up in full force. Two separate materials spread insulating and weather resistant properties around the jacket's body. The whole jacket is made of Select Thermal Fleece, which uses its loft and moisture transferring powers to make cold and wet disappear. Panels of the new Select Barrier WxB fabric on the front and upper arms shine against the overcast elements, bringing a healthy dose of wind resistance and waterproof properties to key areas of the jacket. The material also has a four way stretch for ease of movement, and the jacket is cut spaciously enough to accommodate additional thermal layering for when the temperatures get low but you're still down for a bike ride. The seams are fully taped, the full length front zipper is waterproof and has an internal wind flap, and the rear hem has a drop tail with an elastic drawcord to deny the elements any foothold of ingress. Even the cuffs conspire against the weather with an asymmetrical cut that extends coverage over your gloves to ensure there are no gaps. A single rear pocket with a media cable port afford plenty of storage, and reflective elements help keep you visible in low light conditions. The Pearl Izumi Select Thermal Barrier Jacket is available in five sizes ranging from Small to XX Large in the colors Black, BlackMykonos blue, Blackscreaming yellow, and Blacktrue red.