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 you’re likely to be static and glassing for extended periods in extremely cold climates. Highly compact-able, the Thermolite Vest is your first choice insulation layer that will be ready-to-go when you slow down on the hills or for when you’re back around camp during plummeting temperatures. Packed with ultra-warm Primaloft® Silver down blend, the Thermolite Vest provides you with high insulation, protection from the wind, water resistance and ultimate comfort (thanks to is 4-way stretch durable fabric). Using welded baffles, this vest is purpose built to provide ultimate protection from the elements and promote high insulation warmth to your core during plummeting temperatures.