Think Baffin Island, Denali, the Karakoram in winter: The R3 Hi-Loft Jacket is Patagonia's warmest layering piece. Compressible and resilient, it's perfect as a toasty mid layer or on its own in chilly, dry weather. Made of high-loft Polartec Thermal Pro polyester fabric, the plush R3 fabric wicks moisture, dries quickly and caches heat when temperatures plunge. Polartec Power Stretch panels under the arms and down the sides allow for a clean fit, full mobility and enhanced durability. Soft microfleece lines the collar, cuffs and hem; two handwarmers and a zippered chest pocket keep stash secure; a drawcord hem traps heat.