The Calypso Jacket pairs a water-resistant, windproof shell with Thermolite synthetic insulation, delivering warmth without bulk or animal-derived materials. Fleece-backed sleeves add soft insulation where it counts, while a fixed hood and elasticated cuffs and hem lock out wind and cold air for a secure, adaptive fit. Breathable, protective and effortless, a go-to spring jacket for women who need one layer that does everything. If you prefer a more relaxed feel, size up.