Sporting a full draft collar, premium 850-fill goose down, and highly breathable shell fabric, the astonishingly light Western Mountaineering Versalite 10-Degree Down Bag is ideal for three-season trekking, kayaking, and bike-touring. High-alpine climbers looking to shed a few pounds will appreciate its unmatched warmth-to-weight ratio, and mountaineers looking to push the limits of their shoulder-season gear can glean a bit more insulation from layers thanks to a wider shoulder circumference.