Lightly insulated so it stands up to cool weather on its own, we made sure all three layers of the Rion Vest—outer shell, lining and insulation—have built-in stretch. The result is an elevated layering staple that moves with you like none other. Rion StretchShell Insulated Gilet Product Features : Water-repellent with a PFC-free finish helps protect against light rain and wind keeping you comfortable in changing conditions, Cool Climate Insulation™ provides lightweight warmth for cold-weather comfort, Two-way full zip allows you to unzip from the top or bottom for airflow or comfort in the saddle Men's Rion StretchShell Insulated Vest in Black, Size: XS by Ariat