The Feathered Friends Petrel 10 YF is a women's-specific mummy bag built for three-season use, insulated with RDS-certified 900+ fill power goose down under a Pertex YFuse 20D mini-ripstop shell. At 912 g total weight, with 565 g of down fill, it sits on the lighter end for a -12°C (10°F) rated bag, though the water-resistant, not waterproof, shell means it's better suited to conditions with reasonable weather management than to sustained wet exposure.
The short-length cut (up to 160 cm user height) follows a women's anatomical taper — 145 cm shoulder, 150 cm hip, 104 cm foot box — narrower through the shoulders and roomier at the hips than a unisex bag of comparable warmth. A full-length, two-way zipper on the right side pairs with a draft collar and draft tube to cut heat loss at the closure, while the fitted contoured hood and trapezoidal foot box round out the fit.
Both a compression stuff sack and a mesh storage sack ship with the bag. Recycled liner fabric and bluesign certification make it a reasonable pick for hikers weighing the environmental footprint of their gear alongside straight performance.