With Arctic Shield's Retain heat retention technology, these Boot Insulators help you stay out longer in your tree stand or blind. Retain technology is an aluminized polypropylene core layer in the fabric system. This thin aluminized layer captures and returns up to 90% of your body heat back to you. Simultaneously, it deflects cold outside air away from the skin to keep hunters out longer, despite the conditions. Lightweight, easy to pack, and constructed of durable materials, this legendary product makes it easy to defy the wind, water, and thermometer. FeaturesRetain heat retention technologyPolyester outershell and linerWindproof, water resistantLightweight, packableRoll up to fit in pocket or backpack