The Thermolite Vest has been specifically designed to provide maximum core warmth and comfort without the bulk of traditional insulated vests. Ideal lightweight layering to wear underneath your rainproof shell when sitting for extended periods in extremely cold climates. Highly compactable, the Thermolite Vest is your first choice insulation layer that will be ready-to-go. Packed with ultra-warm Primaloft® Silver down blend, the Thermolite Vest provides you protection from the wind, high insulation, water resistance and ultimate comfort thanks to is 4-way stretch durable fabric. Using welded baffles, this vest is purposely build to provide ultimate protection from the elements and promote high insulation warmth to your core during plummeting temperatures.