The boundary between sun and shadow on rope length 13 is reason enough to bring the Nano Puff Jacket. As a minimal belay jacket for icy rock routes or as protection against cold during winter storms, it retains heat and blocks the wind. Its shell is made from 100% recycled polyester, repelling moisture and minimizing friction in the layering system. The slim, hydrophobic, and highly compressible 60 g/m² PrimaLoft Gold Insulation Eco now contains 55% recycled content. It is the most efficient synthetic insulation on the market, offering an excellent warmth-to-weight ratio and retaining 98% of its insulating power even when wet. The jacket features a fitted cut with close horizontal baffles on the tapered sides. Its soft, moisture-wicking interior wind flap and zipper cover enhance wearing comfort.