The Feathered Friends Swallow UL 20 is an ultralight three-season mummy bag filled with 476 g of RDS-certified 950+ fill power goose down under a Pertex Quantum Pro shell (a 7D/30D ripstop blend) with a DWR finish. At a -7°C (20°F) limit rating and just 754 g total weight, it's among the lightest three-season bags in the range — the trade-off, again, being a DWR-treated shell rather than a membrane, built to be used under a tent rather than exposed to direct rain.
At 150 cm shoulder, 140 cm hip, and 107 cm foot box, it runs wider than the related Hummingbird model, trading a small weight penalty for a more comfortable sleep. Continuous baffle construction and a full-length, two-way zipper on the left side are paired with a draft collar, draft tube, and an adjustable, fitted hood.
Both a stuff sack and storage sack are included, and it comes in orange or gray. Regular size covers user heights up to 183 cm.