UNDER-VESTUNDER VEST Weight Upgrade for the Uni Vest UNDER VEST patented new design from IRONWEAR makes it possible to nearly double the weight of your existing Uni Vest. UNDER VEST is a padded liner that fits under and connects to your Uni Vest and has pockets for additional Flex metal weights. UNDER VEST is a great up grade for your Uni Vest whether you want more padding or to carry more weight. UNDER VEST gives you the flexibility to quickly set up your vest