The North Face Men's ThermoBall Jacket is extremely versatile, great
for a variety of conditions. Synthetic ThermoBall insulation won't retain
water like typical down insulation which loses it loft and warmth when wet.
Cotton ball-like shape of fibers (instead of traditional long strands) keeps the
PrimaLoft clusters together, creating a pocket of air that retains heat.
Similar to the Nano Puff from Patagonia, the ThermoBall is lightweight and
highly compressible, stowing into a hand pocket for convenient travel.