The Rab Women's Cirrus Vest is a seriously versatile insulator intended to warm your core all year long. The synthetic lightweight insulation has the same look, feel, and loft as down insulation, except that it stays warm in wetter climates. Pertex Quantum's windproof, water-resistant shell sheds light moisture and blocks brisk breezes for core coverage. You can pack the vest inside its own pocket for compact storage. The Cirrus features a regular fit for easy layering, and elastic armholes work with the adjustable hem for snug coverage.