The technical R2 Jacket is made of breathable, compressible, stretchy, high-loft Regulator fleece for superior lightweight insulation under a shell. Chilly crags, half-frozen trails, and backcountry corn snow are all equally fine playgrounds for Patagonia's R2 Jacket. The highly-refined construction and fabric of this Regulator fleece jacket traps heat and breathes freely, with the main body relying on high-loft Polartec Thermal Pro recycled polyester fabric, which is superlight, wicking, compressible, stretchy, and soft. An R1 Polartec Power Dry high/low grid panel runs along the underside of the arms, down the sides, and across the lower-front torso, hybridizing the jacket to improve fit and mobility and extend your comfort range. The cuffs have discreet, on-seam thumb loops; the softly lined inner collar and kissing-welt zipper garage are soft on the neck and chin; Sonic/Stitch seam construction reduces bulk on the center-front zipper; offset shoulder seams stay clear of pack straps; zippers close the external pockets (one chest and two handwarmers, above harness line); handwarmers’ mesh pocket bags double as internal drop-in pockets.