WeightedHands: We Got Your Back. Do the makers of dumbbells have your back? No. But we do. Here’s why. The Difference Between The Original Heavyhands Back Straps and The New Flex Fit Back Straps are clear. The new Weighted Hands flex fit back straps are better than Heavyhands back strap because they are flexible. Plus we design, measure and cut to form fit YOUR hand. Previous Heavyhands model have no flex and produce force during use that many report to be uncomfortable. For more details and photos of Weighted Hand Flex Fit Back Strap, go to https://www.weightedhands.com/heavyhands-back-strap/