From Dr. Neil Katz. He sent this after testing out his new fitted Ergonomic Weighted Hands grips. Here’s what he said. “Michael, The snug back straps are perfect. I like a tight fit. I have 4 or 5 sets of the AMF and Lyons handles and have wrapped them with tape and resorted to using a sticky Underarmor glove to get the desired tightness, but who wants to use a glove in warm weather. I just ordered the the 2 1/2 pound weights. Like I told you, I have done Heavyhands walking since Dr. Schwartz wrote his book. Your handles take it to a more productive and enjoyable level. Dr. Schwartz would have loved them. They are worth their weight in gold. Neil Katz” Link below has up close images of how these grips are different and more details how why you’ll get more from them compared to the old Heavyhands handles. https://www.weightedhands.com/ergonomic-grips/